17. Although it's raining, _____ are still working in the field.

A. they B. but they C. and they D. so they

18. Speak to him slowly _____ he may understand you better.

A. since B. so that C. for D. because

19. You'll miss the train ______ you hurry up.

A. unless B. as C. if D. until

20. When you read the book, you' d better make a mark _____ you have any questions.

A. at which B. at where C. the place D. where

21. We'd better hurry ______ it is getting dark.

A. and B. but C. as D. unless

22. I didn' t manage to do it _____ you had explained how.

A. until B. unless C. when D. before

23._____ he comes, we won't be able to go.

A. Without B. Unless C. Except D. Even

24. I hurried _____ I wouldn't be late for class.

A. since B. so that C. as if D. unless

25. _____ I catch a cold, I have pain in my back.

A. Every time B. Though C. Even D. Where

26. What's the matter _____ they still haven't answered the telegram?

A. when B. that C. though D. however

27. Bring it nearer _____ I may see it better.

A. although B. even though C. so that D. since

28. You may arrive in Beijing early _____ you mind taking the night train.

A. that B. though C. unless D. if

29. Helen listened carefully _____ she might discover exactly what she needed.

A. in that B. in order that C. in case D. even though

30. More people will eat out in restaurants _____ they do today.

A. than B. when C. while D. as

31._____ hard she tries, she can hardly avoid making mistakes in her homework.

A. Much B. However C. As D. Although

32. Poor _____ it may be, there is no place like home, _____ you may go.

A. as; wherever B. though; whenever C. in spite of; when D. that; wherever

33. The child was __ immediately after supper.

A. enough tired to go to bed B. too tired to go to bed

C. so tired that he went to bed D. very tired, he went to bed

34. The history of nursing __ the history of man.

A. as old as B. is old than C. that is as old as D. is as old as

35. _____ born in Chicago, the author was famous for his stories about New York.

A. Since B. Once C. When D. Although

36._____ we stood at the top of the building, the people below were hardly visible.

A. As B. Although C. Unless D. In spite of

37. Scarcely was George Washington in his teens _____ his father died.

A. than B. as C. while D. when

38. _____ David goes, he is welcome.

A. Whichever B. However C. Wherever D. Whatever

39. The house stood _____ there had been a rock.

A. which B. at which C. when D. where

40. Small _____ it is, the pen is a most useful tool.

A. because B. so C. if D. as

41. After the new technique was introduced, the factory produced _____ tractors in 1988 as the year before.

A. as twice many B. as many twice C. twice as many D. twice many as