单选题She opened the door quietly ______ wake up her sleeping baby.

单选题Frankfurt, Germany, is one of the most ______ populated regions in Western Europe. A. densely B. vastly C. enormously D. largely

单选题My suitcase was so full that it didn’t have _____ for anything else.

单选题Speaker A: Would you care for another helping? Speaker B: ______

单选题Walter offered us a lift when he was leaving the office, but our work ______, we declined the offer. A. not being finished B. had not been finished C. not having been finished D. was not finished

单选题I think Father would like to know ______ I've been up to so far, so I decide to send him a quick note.

单选题______ such a good chance, he planned to learn more.

单选题His ______ of the aeroplane was correct in every detail and could really fly.

单选题Lucy: Tom, would you like a drink?Tom: ______

单选题______ we need air and water, so do we need criticism and self-criticism.

单选题The sun warms the earth, ______ makes it possible for plants to grow.

单选题Vitamins do not provide energy, nor do they construct or build any part of the body. They are needed for ______ foods into energy and body maintenance.

单选题He is such a man who is always ______ fault with other people. A. putting B. seeking C. finding D. looking for

单选题There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be infected by air pollution. Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a "greenhouse effect"—conserving heat reflected from the earth and raising the world"s average temperature. If this view is correct and the world"s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water. Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth"s temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top fanning areas. Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible). Perhaps, if we are lucky enough, the two tendencies will offset each other and the world"s temperature will stay about the same as it is now.

单选题He failed to live Up to __________had been expected of him.

单选题(African) elephants are larger, (fiercer), and (difficulter) to tame (than) Asian elephants.

单选题Yesterday I bought a new tie to _____ this green shirt.

单选题Babies often__________ down when they are learning to walk.

单选题Neighbor: Hi. You said that you might need some help with preparing dinner. What would you like me to do? Hostess: __________ I really appreciate it. First, could you peel the vegetables? I’ve put them all in the sink and there’s a peeler.

单选题I don"t think Mary understood what you said, ______?