You should carefully think over_____ the manager said at the meeting.

A. didn't answer B. wasn't answering 　C. hadn't answered D. haven't answered

A. suppose B. assume C. assure D. grant

A. take off B. set off C. set up D. take up。

A. only B. almost C. merely D. hardly

A. Although; on B. Though; in 　C. Despite; in D. Because of; on

A. stand up B. stand by C. stand for D. stand out

A. Had you come B. Did you come 　C. Have you come D. Should you come

A.、Cell phone use is dangerous。

B、Cell phone use causes cancer。

C、The human brain is an electromagnetic field。

D、There are about 5 billion cell phone users in the world right now。

A、in the late 1970s B. between 1980 and 1985

C、in the late 1980s D. in the early 1990s

A. Brain activity。

B. Her research findings。

C、The fact that cell phone use may cause cancer。

D.、Her research progress。