Mary as well as her sisters ______ Chinese in China（）
A. are studying
B. have studied
C. studies
D. study
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The knife and fork__ dirty. Would you please give me____ knife and fork, please（）
A. is; another
B. are; another
C. is; the other
D. are; other
A traffic accident has just happened around the corner of the street. The police ______ already there（）
A. is
B. are
C. has arrived
D. have arrived
I will write to you ______ I get there（）
A. while
B. as soon as
C. as
D. since
Nobody knows ______ to visit our school（）
A. when will he come
B. when does he come
C. when he will come
D. wen he does come
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