5. C

介词from后应用动词的-ing形式，且settle与problem之间存在着被动关系，故选C。

4. B

此题极易受enjoy后接动词-ing形式的干扰，从而错选A或C。其实，enjoy的宾语是which，即在going abroad与staying at home作出选择；to spend your holiday是作目的状语的。故选B。

3. A

由题意知，农田逐步消失，故应用is getting lost，表示渐进的过程；consider作考虑讲时，后应接动词的-ing形式或带有疑问词的不定式结构。故选A。

2. D

of为介词，后应用-ing形式，且此处是there be结构。故选D。

1. C

warn这一动作发生在主句动作had to go之前，应用-ing的完成形式，且与主句的主语存在着被动关系；a friend与follow之间是主动关系。故选C。

30. ____ at a college or university in the USA, Chinese and other international students must demonstrate a strong ability in spoken and written English.

　 A. Having been accepted　　　 B. To be accepted　　 C. Being accepted　　　　　 D. Accepted

[答案与解析]

29. With a lot of difficult problems ____, the manager felt worried all the time.

　 A. settled　　　　 B. to be settled　　　　 C. settling　　　　 D. to settle

28. As we all know, it was _____ that resulted in the terrible car accident.

　 A. because of her carelessness　　　　　　　　　　　 B. her being careless

　 C. because she was careless　　　　　　　　　　　　　 D. she was so careless

27. In order not to be disturbed ,I spent three days　　　 in my study.

　 A. locking　　　　　　　　　 B. locked　　　　　　　　　 C. to lock　　　　　　　　　 D. lock

26. With online course Crazy English has over 20 million students all over China 　　　　　the class through the Internet .

　 A. attend 　　　　　　　　　 B. attended 　　　　　　　 C. attending 　　　　　　 D. to be attending