This is _____ I can do for you right now.
A. which
B. that
C. what
D. as
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It was at our college library _____ I borrowed the novel.
A. which
B. in which
C. that
D. where
I have seen trees, _____ open at sunrise and close at sunset.
A. which the leaves
B. of which leaves
C. whose leaves
D. its leaves
The foreign guests, _____ were scientists, were warmly welcomed at the airport.
A. most of whom
B. most of them
C. most of which
D. most of those
Put the letter ______ he can find it easily.
A. in which
B. at which
C. where
D. which
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