____ a great contribution to his country, Tom was awarded a medal of honor bythe government.
A. Have made
B. Made
C. Having made
D. Making
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When guests or friends come to our home, the etiquette of____and________ teais indispensable.
A. make; serve
B. making; serving
C. made;served
D. having made; having served
Lilys sudden__ made her parents hard to accept.
A. leaves
B. left
C. leaving
D. to leave
There's no ______ whether it will rain or not.
A. known
B. knowing
C. know
D. knew
I think it is a waste of time __ to Peter. He never answers anybody.
A. talk
B. talked
C. to talk
D. talking
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