We must finish our homework _________ time.
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My aunt has worked in a hospital _________ 1958.
A. after
B. since
C. till
D. before
We have built a bridge _________ the wide river.
A. above
B. over
C. on
D. at
Egypt is famous _________ its pyramids.
A. of
B. in
C. about
D. for
He ran a hundred metres _________ thirteen seconds.
A. at
B. by
C. with
D. in