Don’t try doing it yourself. It requires ______ knowledge.
A. special
B. specialized
C. specialty
D. specialize
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The letter ______ to me yesterday was from my brother.
A. sent
B. which sent
C. sending
D. sends
Today, many factories make porcelain plates and other objects ______ throughout the world.
A. sells
B. selling
C. to sell
D. sell
He takes a cold shower every morning before ______ to work.
A. going
B. he has gone
C. gone
D. he went
Are you capable________ that tree?
A. of climb
B. for climbing
C. of climbing
D. for climb
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