根据首字母或汉语提示，填写所缺单词，完成句子。

1. Jim like l________ to Chinese music very much.

2. I want to collect some beautiful s_______. Can you help me?

3. Our Great Wall is w________. Many people want to visit.

4. You must r________ the books to me on time.

5. It's d________ to learn Math well. So I don't do well in it.

6. My school life is very i________. What about yours?

7. We can go to Japan by s________ or by air.

8. His study is on the ________ (第二) floor.

9. I think English is very ________ (重要) to us.

10. Look, the sun is shining ________ (明亮). Let's go for a walk.

在需要通信的用户之间建立连接，通信完成后拆除连接的设备是（）.

A.终端

B.交换机

C.计算机

D.调制解调器