It is sometimes difficult to tell the differences the infinitive, the participle and the gerund.
A. of
B. among
C. for
D. between
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It's that so many people like thatTV program.
A. amazing，bored
B. amazing，boring
C. amazed，bored
D. amazed，boring
It wasof you to send me a birthday card.
A. considerable
B. cautious
C. considerate
D. conscious
It was the training that he had as a young man made him such a good engineer.
A. that
B. what
C. when
D. who
It is not until he failed in the testhe realized he should work hard.
A. when
B. before
C. that
D. after
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