单项选择题

Which of the following is NOT the reason for teenagers keeping late hours？（）

A.Doing school assignments.
B.Enjoying entertainment.
C.Suffering from sleep disorder.
D.Taking up various activities.

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单项选择题

You have to work（）faster.

A.a lot
B.a great much
C.a great deal
D.a good much

单项选择题

Which of the following measures do police take to make use of the Internet to solve crimes？（）

A.They use the search engines to find clues about cases.
B.They supervise the suspects’online activities.
C.They try to make friends with the suspects on the Internet.
D.They use the Internet to release emergency notice.