You must ____ the boy’s age; he is very young after all.A、thinkB、knowC、take into accoun

A.How are you？

B.How do you do？

C.You can call me Bo

D.Fine, thanks.

– Excuse me, does this bus go to the bookstore？– ().

A. The bus is so crowded

B. The bookstore is five blocks away

C. No. You'd better change at the next stop

D. You should wait in line

You must keep _____ in the reading-room.

A.still

B.quiet

C.quite

D.quietly

You must put on more clothes in such freezing weather.()

A.have you

B.must you

C.needn’t you

D.didn’t you

A.Yes, you must

B.No, you mustn't.

C.No, you don't have to

A.are

B.been

C.being

D.be