12、Only when he had handed in his exam paper, ____ he had made several grammatical mistakes.(B)
A、he realized
B、did he realize
C、he has realized
D、realized he
13、Hard ____ diamond is, it is quite easy to drill a hole in it with laser.(D)
A、although
B、though
C、like
D、as
14、No sooner ____ the bell rung than the class began.(A)
A、had
B、was
C、has
D、there was
15、____ had I sat down when I heard someone knocking at the door.(B)
A、No sooner
B、Hardly
C、Before
D、After
16、No teacher and no student ____ admitted into the laboratory.(D)
A、are
B、were
C、not is
D、is
17、Tom as well as two of his classmates ____ invited to the party last night.(D)
A、are
B、were
C、have
D、was
18、A committee of five men and three women ____ to consider the matter.(A)
A、is
B、are
C、were
D、will
19、During the holidays, every train and bus ____ crowded.(A)
A、was
B、are
C、were
D、are not
20、This is the key ____ an improvement of their living conditions.(B)
A、of
B、to
C、for
D、about
21、It is no use ____ him to come now. He is busy.( D)
A、ask
B、to ask
C、asked
D、asking
22、Fifteen miles ____ like a long walk to me.(C)
A、seem
B、is seemed
C、seems
D、are seemed
23、Other possibilities ____ at the meeting yesterday.(A)
A、were talked about
B、are talking about
C、is talked about
D、is talking about
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