They each ____ a beautiful handkerchief.
A. have
B. has
C. is
D. are
This pair of shoes ____made in Nanjing.
A. is
B. are
C. has been
D. had been
Father went to his doctor for ____about his heart trouble.
A. an advice
B. advice
C. advices
D. the advices
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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