单选题This is a nice car, but we cannot ______ it.

单选题Andy: My schedule (安排表) this afternoon is an absolute mess. Between 3:30 and 4:00 I"m supposed to be in four different places. There is no way. Frank: I"ve done that before. ______?

单选题The weather is not as cold as you think. So I don't think the ice is thick enough to walk on it.

单选题Before the final exam, many students have shown ______ of tension (紧张). Some have trouble in sleeping while others have lost their appetite (胃口).

单选题—Excuse me, sir. Would you please tell me how to get to Beijing Hotel? —______. Would you like to take a bus or walk?

单选题He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.A. whileB. whenC. the momentD. unless

单选题He studied hard at school when he was young, ______ contributed to his success in later life.

单选题What"s the matter with you? You ______ so pale.

单选题People and the sources of air pollution are found in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major source of air pollution is the gas fumes from cars. Statistics show that 93 percent of all auto trips are within cities. Another major source of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the country. On the average, we throw away more trash and garbage than the previous year. The burning of garbage contributes to air pollution. Many major industries are also responsible for the dirty air in the around cities. The fumes from iron, steel, chemical, and petroleum production add particles to the air. The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy for traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode. In some of the larger cities, these fumes endanger the live of human beings by contributing to lung diseases and causing early death. Therefore, it"s high time to stop making our living places unsuitable to live and killing ourselves.

单选题Everything comes with a ______, that is, there"s no such thing as a free lunch in the world.

单选题No matter (however) hard he (tries), he never (seems) able to finish his work (in time).

单选题It was ______ that he couldn' t finish it alone. A. a so difficult job B. such a difficult job C. so a difficult job D. such difficult a job

单选题(Did) you see (that) boy (been questioned) by (the) police?

单选题Call the university operator, ______ you will find the phone number of Professor Smith.

单选题She looks tired. She ______ last night. A. should have stayed up late B. must have stayed up late C. need have stayed up late D. would have stayed up late

单选题Mavis: How is everything, Ruth? Ruth: ______

单选题The old man got into the______of storing money under the bed.

单选题______ anything about the accident, he went to work as well.

单选题The company has ______ heavy financial losses over the last two years.