He looked quite healthy ____ he was ____ the age of seventy.
A. when; at
B. because; in
C. if; for
D. though; at
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- How long has the bookshop been in business? -____1982.
After
B. In
C. From
D. Since
Did you have any trouble ____ the post office?
A. to have found
B. with finding
C. to find
D. in finding
To tell you the truth, I have nothing to do ____ it.
A. about
B. with
C. for
D. of
Something must be done to prevent our city ____ by thick smoke.
A. to be polluted
B. from polluting
C. from being polluted
D. polluting