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You ______ make noise in the classroom,

A. can"t
B. mustn"t
C. have not
D. need not

无尿是指24小时尿量少于______

A. 200ml
B. 150ml
C. 100ml
D. 50ml

The policeman asked him some questions. He remained ______. (silent, silently)

These questions ______ in English.

A. answer
B. must answer
C. must be answered
D. can answer