It was the first time that I ___________ the night face to face. 
#101477
A
had seen
B
have seen
C
see
D
seeing
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When he looked up, he suddenly found himself       by a group of teenagers,       looked at him anxiously.
#103267
A
to be surrounded; which
B
surrounded; who
C
be surrounded; who
D
having been surrounded; which
We are confident that the environment ________ by our further efforts to reduce pollution.
#100189
A
improves
B
will be improved
C
has improved
D
was improved