52._____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
A.While B.As C.If D.Since
51. Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests.
A. before B. since C. when D. after
50. So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.
A. then B. what C. that D. which
49. I wrote to my parents once a week,____ I was too busy with my teaching work.
A. it B. unless C. when D. as
48.I wonder ____ we can solve this hard problem.
A. what else B. how else C. that D. as if
47. Mr Smith is ______ a good teacher ______ we all respect.
A. such;that B. such; as
C. so;that D. so; as
46. Wang Ling was elected ______ all he is the tallest.
A. because B. because of
C. for D. as
45. - Was it under the tree ______ you were away talking to a friend?
- Sure. But when I get back there, the bike was gone.
A. that B.where C. which D. while
44. He will tell you _____ he expects will win such a match.
A. why B. whom C. which D. who
43. We should do more such exercises in the future, I think, _____ those we did yesterday.
A. as B. like C. about D. than
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