3.(　 ) Some people are sitting on the grass; others are walking along the lake, ______ .

　　 A. chatting and to laugh

　　 B. to chat and to laugh　　　

　　 C. chatting and laughing　　

　　 D. chatted and laughed

2.(　 ) Over years, scientists have made a great _____in the treatment of cancer.

　　 A. break-in　　　　　　　 B. breakthrough　　

　　 C. breakup　　　　　　　　 D. breakdown

1.(　 )Many children think they are ______ with when their parents are trying to show concern about them.

　　 　A. interfered　 　 B. separated　　 C. disturbed　　 D. offended

15.The date of the move has not been _________________ decided yet (= it may change).

14. The negotiations(谈判) have been _______________ in a positive manner.

13.The legal ___________________ has / have always resisted change.

12.The government has been _______________ in its response to the report.

11.Police are ______________ anyone who saw the accident to contact them immediately.

10.The report ____________________ that all buildings be fitted with smoke detectors.

9.She talks _____________about her problems.