资源看点：对所学基础知识进行分课练习，同步实用。

Lesson 45

I. 根据句子意思用适当的介词填空。

1. Wang Mei, who are you waiting ____________ here?

2. The answer ____________ this problem is very easy.

3. I want to send an e-mail ____________ my friend.

4. What’s the disadvantages ___________ chatting on the Internet?

5. Don’t worry ____________ your lessons. We can help you.

II. 从方框中选择适当的动词并用其正确形式填空。

6. Here is a telephone call for you. You need ____________ it at once.

7. Li Ming, can I ___________ a message for you?