答案　A

解析　考查with复合结构。children和surround存在逻辑上的主动关系，故用现在分词作宾语补足语。

10．-Why are so many northern Chinese visiting Southeast Asia countries recently?

-They are trying to get a s________ helter from the cold weather in winter.

A．magic B．reliable

C．permanent D．temporary

答案　D

解析　考查形容词辨析。句意为：--为什么近来那么多北方的中国人到访东南亚国家？--他们正试图找到一个躲避寒冷冬季的临时庇护所。temporary临时的，符合句意。magic魔术的；reliable可靠的；permanent永久的。

11．-How come you look so worried?

-I have __________ all my pockets but I can't find my keys.

A．gone after B．gone through

C．gone against D．gone ahead

答案　B

解析　答句句意为：我把所有的口袋都翻遍了，就是找不到我的钥匙。Go after追求；go through检查，经历；go against违背；go ahead开始，进行。

12．All flights ________because of the air traffic control，the passengers had to wait in the hall.

A．were put off B．having put off

C．have been put off D．having been put off

答案　D

解析　前后两个分句之间无连词，前半句只能用分词形式，故排除A、C两项。独立主语all flights与put off之间是被动关系，且发生在主句谓语动作之前，故D项符合句意。句意为：因为航空管制，所有航班都被取消了，乘客们不得不在候机厅里等候。

13．The last thing___________ is __________all the books and lock the door.

A．to do；put away

B．being done；to put down

C．to be done；to put up

D．to do；to put through

答案　A