27.Mary__________at home, for she never goes out this time at night.
A. can't be
B. can be
C. must be
D. may be
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28.In some parts of the world, tea__________with milk and sugar.
A. is serving
B. is served
C. serves
D. served
29.I'll leave him a message. Would you please give me__________.
A. papers
B. some papers
C. a sheet paper
D. some paper
30.Mr.Wang wrote a book on teaching when he was__________.
A. sixties
B. in sixties
C. in the sixties
D. in his sixties
31.After his mother bought him an ice cream, the little boy became a little__________.
A. happiest
B. happily
C. more happily
D. happier