C．except D．unless

答案与解析：A　句意：如若您不介意在旧金山改换航班的话，你可以今天下午飞往纽约。理解句意可确定答案是A项。

10．-Whose advice do you think I should take?

-________.

A．You speak B．That's it

C．It's up to you D．You got it

答案与解析：C　分析题目可知一方询问应接受谁的建议，另一方说接受谁的建议要取决于他自己，故答案是C项：It's up to you. 这取决于你。/由你决定

11．Nobody but doctors or nurses and those________by Dr. Hu________to enter the patient's room.

A．invited；is allowed

B．are invited；are allowed

C．being invited；allowed

D．invited；are allowed

答案与解析：A　分析句子结构可知主语是nobody, 第一个空格处用过去分词作定语，第二个空格处填写的是谓语动词，故答案是A项。

12．-I can't find Mr.Smith.Where did you meet him this morning?

-It was in the hotel________he stayed.

A．that B．which

C．the one D．where

答案与解析：D　本题考查where引导的定语从句，修饰名词hotel。

13．-I'll thank you________my affairs alone.

- -I will.It's none of my business.

A．for leaving B．not to leave

C．for not to leave D．to leave

答案与解析：D　I'll thank you to do...意思是：求你做......；......好不好？并不是用来表示感谢的，而是不愿意让对方插手自己的事的时候所说的。这句话的意思是：我的事你不要管好不好？还例I'll thank you to shut up your foul mouth.闭上你的臭嘴好不好？

14．We shouldn't________him for the mistakes he has made.

A．accuse B．blame

C．charge D．claim

答案与解析：B　accuse sb. of ...以......罪名指控某人 blame sb. for ...因......责备某人 charge sb. with ...指控某人...... claim是及物动词，"要求(拥有)；索取，认领"。理解句意可知答案是B项。

15．At times the balance in nature is________，resulting in a number of possibly