The definition leaves______for disagreement.

You______yesterday if you were really serious about this project.

The student continued his university study____his family was poor.

这个国家的人口继续以每年1200万人的速度增长。

—Must we send in our plan this week?—No, ______; you can send it in next week.

Henry is often seen______English aloud every morning in the classroom.

The young soldier was______wounded in the war and died a few days later.

Today Mrs Smith_____herself in white like a nurse at the garden party.

There are five pairs______, but I'mata loss which to buy.

As the Titanic was sinking and women and women climbed into lifeboats, the musicians from the ship's band stood and played.

They couldn' t afford to eat in a restaurant because none of them had______money on them.

If the Dakota Access Pipeline(输油管道) is completed, it will carry nearly half a million barrels of oil across four states every day. Energy Transfer Partners (ETP) , a Texas-based company behind the $3. 8 billion project, hopes to finish construction this year. But the Standing Rock Sioux, an American Indian tribe(部落), is determined to stop the 1,172-mile pipeline from being built. (76) Both sides show no signs of backing down. The Dakota Access Pipeline was announced in 2014. A section of it will run near the Standing Rock Sioux reservation. A reservation is an area of land set aside for American Indians. The tribe says the construction threatens to destroy historical areas and ancient burial sites. They also say the pipeline could pollute their main water source, the Missouri River. In April, the Standing Rock Sioux began a protest against the project. They camped at the construction site. Since then, thousands of people, including people from American Indian tribes, have traveled to the site to join the protest. ETP says that the pipeline will have built-in safety measures to protect against oil leaks. Workers will also monitor it remotely, and will be able to close valves (阀) within three minutes if leaks are detected. American Indians have been staging a nonviolent protest for months. The protest took a turn last week when police were called to keep the peace between protesters and armed security guards hired by the company. (77) Twenty-eight people have been arrested since then and charged with interfering with the pipeline construction.

When I was young, I spent my summer vacations on my grandparents' farm. The summer that I graduated from college, I【C1】______ my grandparents once again. When I arrived, I discovered that there was a family【C2】______ in progress. Grandpa's dog and hunting partner, Rusty, had taken on a very bad【C3】______ in his old age. He had begun【C4】______ into the chicken coop(鸡笼) and eating eggs. In the eyes of the local farmers,【C5】______ dogs started stealing eggs, there was no【C6】______ to cure them. They knew there was only one thing to be done【C7】______ such a dog—you had to shoot it and the sooner the【C8】______ . Rusty and Grandpa were old friends. Grandpa certainly didn' t【C9】______ to shoot Rusty, but he knew it needed to be done. The "egg money" was Grandma' s private income, so you can imagine【C10】______ she felt about the problem.【C11】______ the inexperienced confidence of youth, I told Grandpa that I thought I could "cure" the egg-stealing dog. I wanted to at least have a【C12】______ to save Rusty' s life, and save Grandpa from the sadness of【C13】______ Rusty. The next morning, I broke open six fresh eggs and put them in Rusty's bowl【C14】______ at the door to the chicken coop. Rusty came【C15】______ and noticed the eggs. He quickly【C16】______ the eggs and happily walked off for his nap(打盹). The following morning I did the【C17】______ thing. I put the eggs a few feet away from the chicken coop, toward the back door of the farmhouse【C18】______ Grandma usually fed Rusty. The next day I again moved the bowl closer to the house, and added some dog food to the eggs. Every day I moved the bowl closer to the back door, mixing more dog food and【C19】______ eggs. By the time the bowl reached the door, it was all dog food and no eggs. Rusty had again become【C20】______ to looking for his food at the back door of the house, and never again went into the chicken coop.

Some areas, ______their severe weather conditions, are hardly populated.

I was trying to get into the ______bus when I heard a voice from behind.

Since 1970, Mr. Johnson______in this hospital and he loves the job very much.

Not all persons arrested and______with a crime are guilty.

It seems like every day there's some new research about whether our favorite drinks are good for us. One day, science says a glass of red wine a day will help us live longer. The next day, maybe not. It seems journalists are pretty interested in wine research and the same might be said for coffee. Now, there's been a lot of research into whether coffee's good for our health. " The results have really been mixed, " admits Neal Freedman who led the coffee study and published his findings in a medical journal recently. "There's been some evidence that coffee might increase the risk of certain diseases and there's also been maybe more recent evidence that coffee may protect against other diseases as well. " Freedman and his colleagues undertook the biggest study yet to look at the relationship between coffee and health. They analyzed data collected from more than 400, 000 Americans ages 50 to 71 participating in the study. " We found that the coffee drinkers had a modestly lower risk of death than those no-drinkers, " he said. Here's what he means by "modestly": those who drank at least two or three cups a day were about 10 percent or 15 percent less likely to die for any reason during the 13 years of the study. When the researchers looked at specific causes of death, coffee drinking appeared to cut the risk of dying from heart disease, lung disease, injuries, accidents and infections. Now, Freedman stressed that the study doesn't prove coffee can make people live longer. A study like this can never prove a cause-and-effect relationship. All it can really do is to point researchers in the right direction for further investigation. And even if it turns out that coffees really good for you, scientists have no idea why.

When the United States Congress created Yellowstone National Park in 1872, the goal was to set aside a place where Americans could enjoy the beauty of nature for years to come. Now, 142 years later, there are hundreds of national parks across the country, and technology is changing the way people experience them. Should park visitors be able to use cell phones, or should their use be restricted? "Connectivity presents a real challenge to all of us. " Al Nash says. He is a public affairs officer at Yellowstone National Park. He says cell phone service at Yellowstone is available in parts of the park with stores and campgrounds. This makes it easy for visitors to share photos of their trip on social networking sites and to stay in touch with friends and family members. If a park visitor is hurt or in danger, cell phones make it easier to get help. Some say the ability to download applications that provide information about plants and animals in the park can enrich a visitor's experience. Others say cell phones disturb people's enjoyment of our national parks. In their view, cell phone towers are an eyesore, and they'd rather hear the sound of birds than the ring of an incoming call. Can you imagine looking out a peaceful lake or field of grass only to be disturbed by a person shouting into their phone, "Can you hear me now?" Nash says Yellowstone tries to strike a balance. "Ultimately, our job is to let visitors understand and enjoy nature better while protecting what people find special about Yellowstone, and one of those things that's special is the ability to get away from the hustle and bustle (喧嚣) of one's daily life. "

A successful scientist needs______if he wants to make hypothesis(假设)of how processes work and how events take place.