Scientists hope they can _______ in cloning.
A. make a breakthrough
B. make a fuss
C. make a backbreaking
D. make a faith
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She fetched the bricks four_____ in order to save time.
A. in time
B. at a time
C. on time
D. at the same time
Only in a few countries ____ enjoy a reasonable standard of living.
A. the whole of the population
B. where the whole population
C. does the whole of the population
D. will the whole population
Can you _____ that problem?
A. work for
B. work out
C. work over
D. work in
I am _____ of that college.
A. on the staff
B. in the staff
C. at the staff
D. with the staff
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