The air in big cities _____very dirty by factories.
A. are often made
B. is often made
C. have often made
D. has often made
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The Chinese people _____hard-working and brave.
A. are
B. is
C. has been
D. are being
John has two brothers， but either ____out of work now.
A. are
B. is
C. have
D. has
The police ____the murderer everywhere when he suddenly appeared in a theatre.
A. is searching for
B. were searching for
C. are searching for
D. were searching
Apples of this kind ____.
A. tastes good
B. tastes well
C. taste good
D. taste well
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