5.C最佳 分析:C项paid是过去分词作get系词的表语，类似用法如：get married，get arrested，get excited等。说明:句中的by the hour是按照小时(付钱)与之相似的用法有：by the pound, by the month，by the year等。

4.C最佳 分析:该题可以理解成“Losing her new bicycle made Mary so upset. Losing在此是动名词，与her new bicycle一起构成动名词短语作主语。本题区分度为0.413。

3.A最佳 分析:该题意思是“她不能帮助打扫房屋，因为她忙于做蛋糕。”help sb．do sth或help sb. to do sth都是“帮助某人干某事”的意思。注意:这里的can't help doing不是“禁不住”“抑制不住”的意思。说明:与can't help doing相似的有:

　　　 can't help but do sth.　　　　　　　　　　　　 can't but do sth.

　　　 have no choice but do sth.　　　　　　　 can't choose but do sth.

2.C最佳 分析:The Olympic Games与play之间是被动关系，所以排除A、D项。B项是不定式的被动形式，表示将来的动作，故排除。C项是最佳选择。此题可理解为:　　 The Olympic Games，which was first played in 776B.C.，did not include women players until 1912．本题区分度为0.356。

1.B最佳 分析:由but I had to work extra hours to finish a report 这一信息句可知“昨天晚上我本想去参加晚会,而由此我没去”。故B项是正确的。该句可理解为If I hadn't worked extra hours to finish a report，I would have gone to the party last night．

20.He looked around and caught a man _______ his hand into the pocket of a passenger.　 (2004北京春招)

　　 A. put 　　　 B. to be putting　　　　　 C. to put　 　　D. putting　

19. A cook will be immediately fired if he is found____in the kitchen.(NMET2003　 22)

　　 A. smoke　　　　　 B. smoking　　　　　 C. to smoke　　　　 D. smoked

18. The research is so designed that once________nothing can be done to change it.(NMET2002　 34)

　 A. begins　　　　　 　　 B. having begun　 　　　 C. beginning　　 　　　 D. begun

17. It is said in Australia there is more land than the government knows________.(NMET2002　 33)

　 A. it what to do with　　　　　　　　　 B. what to do it with

　 C. what to do with it　　 　　　　　　　D. to do what with it

16. Having a trip abroad is certainly good for the old couple, but it remains______whether they will enjoy it.

　 A. to see 　　　　　　B. to be seen　 　　 C. seeing　　　　 D. seen(NMET2002　 32)