31. They have found many elements in the moon rocks which are round on earth , ______they have not been able to find any sign of life.
A. and B. or C. then D. but
30. We want ______high speed ______good quality.
A. both…and B. either…or C. neither…nor D. not…but also
29. Some are reading newspapers , ______others are playing chess.
A. or B. so C. for D. while
28. I was having a beautiful dream _______someone knocked at the door.
A. when B. as C. while D. since
27. On the farm , the children always did the same work as grown-ups did ______ got paid less.
A. and B. as C. if D. though
26. Dr Robert went to New York , bought some books ______ his daughter.
A. visiting B. to visit C. and visited D. visited
25. It was so hard for them to sail ______ the strong wind.
A. along B. against C. to D. toward
24. I learned German when I was a child , but now I have forgotten everything ______a few words and expressions.
A. instead of B. besides C. except for D. about
23. No one knew Mr. Benson’s address ______his daughter.
A. except B. excepts C. only D. beside
22. We need fifteen more people ______our team to do the job.
A. but B. except C. as well D. besides
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