If no evidence could be provided to prove Martin is guilty, he will soon be______by the police.

The world's population continues to grow. There now are about 4 billion of us on earth, and that could reach 6 billion by the end of the twentieth century and 11 billion in a further 75 years. Experts have long been concerned about such a growth. Where will we find the food, water, jobs, houses, schools and health care for all these people? A major new study shows that the situation may be changing. A large and rapid drop in the world's birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrial nations. Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from home instead of having children. And more governments, especially in developing nations, now support family planning programs to reduce population growth. China is one of the nations that have made great progress in reducing its population growth. China has already cut its rate of population growth by about one half since 1970. Each Chinese family is now urged to have no more than one child. And the hope is to reach a zero population growth with the total number of births equaling the total number of deaths. Several nations in Europe already have fewer births than deaths. Experts said that these nations could face a serious shortage of workers in the future. And the persons who are working could face much higher taxes to help support the growing number of retired people.

______I saw was two men crossing the street.

A Weather B permit , we'll C have the match D tomorrow .

In sport the sexes are separate. Women and men do not run or swim in the same races. Women are less strong than men. That at least is what people say. Women are called "the weaker sex" , or, if men want to please them, "the fair sex". But boys and girls are taught together at schools and universities. There are women who are famous Prime Ministers, scientists and writers. And women live longer than men. A European woman can expect to live until the age of 74, a man oily until he is 68. Are women's bodies really weaker? The fastest men can run a mile in 4 minutes. The best women need 4. 5 minutes. Women's speeds are always slower than men's, but some facts are surpising. Some of the fastest women swimmers today are teenage girls. One of them swam 400 metres in 4 minutes 21. 2 seconds when she was only 16. The first "Tarzan"in films was an Olympic swimmer, Johnny Weissmuller. His fastest 400 metres was 4 minutes 59. 1 seconds, which is 37. 9 seconds slower than a girl 50 years later! This does not mean that women are catching men up. Conditions are very different now, and sport is much more serious. It is so serious that some women athletes are given hormone(荷尔蒙)injections. At the Olympics a doctor has to check whether the women athletes are really women or not. It seems sad that sport has such problem. Life can be very complicated when there are two separate sexes!

Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time , prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles. When a fragrant flavor was added to the vitamin enriched fluid, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time, however, they broke the habit and went back to where the necessary vitamins were. In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement, with a wide selection of baby food before them. They were given whatever food they pointed to or appeared interested in. We are told that at first they showed some unusual eating patterns, but that over a period of time they managed to select well-balanced diet. So, in selecting food, rats and babies do seem to know and act on what's best for them. Apparently, there is a kind of" body wisdom" , which humans soon lose. Most of us do not eat as wisely as we could. Many of our food preferences are culturally determined and influenced by long-established habits. Some people eat fox, dog and blackbirds, while we eat cows and pigs. So what people eat and how much they eat seem to be greatly influenced by what is going on around them.

In order to buy her house she had to obtain a______from the bank.

She was more headstrong than______.

I finally got the job I dreamed about. Never in all my life______so happy.

It's going to rain. You'd better______an umbrella with you.

I'd appreciate______if you would like to teach me how to use the computer.

No matter who you are or where you come from, one thing is certain: you are acquainted with the mosquito(蚊子)—although you probably wish you weren't. Mosquitoes are everywhere. They can be found all over the world, and they come in more than 2, 500 species. Some where, at some time, you have surely met at least one. No one loves the mosquito. But unfortunately the mosquito may decide that she loves you. Yes, She. Only the female mosquito bites. It's not because she's unfriendly: she needs blood to reproduce. The female mosquito is quite selective, and she chooses her victims carefully. First, she uses sensors to find her victim. With these sensors, she tests your body moisture, body warmth, and chemical substances in your sweat. If she likes what she finds, she bites. But if you don't appeal to her, she'11 reject you for someone more appetizing. The next time a mosquito bites you, just remember that you were chosen. You're special. If the mosquito likes you, she settles onto your flesh very gently, and she breaks your skin with her proboscis tip. It's a kind of mouth and it sticks out just below the mosquito's eyes. She stabs the proboscis tip into your skin at once, and if she hits a blood vessel, she'11 get a full dinner in about a minute. After that, the mosquito is tired. Heavy with your blood, she picks a spot—on a leave or a stone—to lay her eggs. Just one drop of blood will produce hundreds of eggs.

She was afraid of germs and diseases.

How I wish every family______a large house with a beautiful garden.

1 have taken many photos. I'm going to get the film( ).

I'd rather he______tomorrow afternoon.

It was not______the fire fighters came.

If my father will not agree to sign the papers,______.

When products made in factories______, they are thrown away as garbage.

Coffee is a powerful drink. On a personal level, it helps keep us awake and active. On a much general level, it has helped shape our history and continues to shape our culture, Coffee plants grow wild in parts of Africa and were probably used by travelling tribes (部落)for thousands of years, but it wasn't until the 1400s that people figured out they could roast its seeds. By the 1500s, the drink had spread to coffeehouses across the Arab world. It is often said that after the Boston Tea Party of 1773, when American colonists (殖民者) attacked British tea ships and threw large boxes of tea into the harbor, Americans everywhere switched over to drinking coffee.