The earth is about________ as the moon.
A. as fifty time big
B. fifty times as big
C. as big fifty times
D. fifty as times big
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China is larger than _________ in Africa.
A. any other country
B. other countries
C. the other country
D. any country
—How long _____each other before they _____here?—For about a year.
A. have they known, come
B. did they know, came
C. do they know, come
D. had they known, came
Mr. White, who ________ in Shanghai for seven years, is a manager of a company in Beijing.
A. was working
B. worked
C. had worked
D. has worked
My son turned to bookstores and libraries seeking information about the book recommended by his professor, but ________ none.
A. would find
B. had found
C. found
D. has been finding