1. Theres no way of knowing why one man makes an important discovery _ another man, also intelligent. fails.A. since B. if C. as D. while2. From space, the earth looks blue. This is _ about seventy-one percent of its surface is covered by water.A. why B. how C. because D. whether3. Its much easier to make friends _ you have similar interests.A. unless B. when C. even though D. so that4. You must learn to consult your feelings and your reason _ you reach any decision.A. although B. before C. because D. unless5. She says that shell have to close the shop _ business improves. A. if B. unless C. after D. when6._ we have enough evidence, we cant win the case. A. Once B. As long as C. Unless D. Since7. Mark needs to learn Chinese _ his company is opening a branch in Beijing. A. unless B. until C. although D since8._I have to give a speech, I get extremely nervous before I start.A. Whatever B. Whenever C. Whoever D. However 9. I have heard a lot of good things about you _I came back from abroad. A. since B. until C. before D. when10. In the global economy, a new drug for cancer, _ is discovered, will create many economic possibilities around the world.A. whatever B. whoever C. wherever D. whichever11. I took my driving license with me on holiday, _I wanted to hire a car.A. in case B. even if C. ever since D. if only12. He is so busy. He cannot afford enough time with his son _ he wants to.A. even if B. as if C. because D. before13._ small, the company has about 1,000 buyers in over 30 countries.A. As B. If C. Although D. Once14. One can always manage to do more things, no matter _ full ones schedule is in life.A. how B. what C. when D. where15. We should try to get a good nights sleep _ much work we have to do.A. however B. no matter C. although D. whatever16. Make a mark _ you dont understand. A. why B. in which C.where D. what17. _ the number of such developments is relatively small，the potential market is large.A. As B. When C. Since D. While18. Tom is so independent that he never asks his parents opinion _ he wants their support.A. since B. once C. unless D. after19._ you can sleep well, you will lose the ability to focus, plan and stay motivated after one or two nights.A. Once B. Unless C. If D. When20. By boat is the only way to get here, which is _ we arrived.A. where B. when C. why D. how21. I just sat by the window watching the passing scene _I caught the eye of a waiter and ordered my meal.A. once B. while C.until D. since22. Make sure you save all your work on screen _ the computer breaks down.A.in case B. as if C. so that D. even though23. The gold medal will be awarded to _ wins the first place in the bicycle race.A. whomever B. wherever C.whoever D. whatever24._ birds use their feathers for flight, some of their feathers are for other purposes.A. Once B. If C.Although D. Because25. Lets not pick these peaches until this weekend _ they get sweet enough to be eaten.A. ever since B. as if C. even though D. so that26. He studied hard and later became a well-known writer, which was _ his father had expected.A. why B. how C. that D. what27. Located _ the Belt meets the Road, Jiangsu will contribute more to the Belt and Road construction.A. which B.where C. why D. when28. Without my parents support, we wouldnt be _ we are now.A. how B. when C. where D. why29. This is _ my father has taught meto always face difficulties and hope for the best.A. how B. which C. that D. what30._ we dont stop climate change, many animals and plants in the world will be gone.A. Although B. While C.If D. Until31. Mrs. Black had such a wonderful time _ she visited her friends in Sydney last year.A. when B. that C. which D. as32. Children who are not active or _ diet is high in fat will gain weight quickly.A. what B. whose C. which D. that答案1-5 DCBBB 6-10 CDBAC 11-15 AACAA 16-20 CDCBD21-25 CACCD 26-30 DBCDC 31-32 AB 学科网（北京）股份有限公司