I’m sure you will do better in the test because you ________ so hard this year.
#101584
A
studied
B
had studied
C
will study
D
have been studying
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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