用括号内所给动词的正确形式填空。

1. When I was young, my grandfather told me that the sun             (rise) in the east.

2. The boy              (take) to hospital at once after he fell off the tree.

3. — You forgot              (close) the window again.

    — Really? I won't next time.

4. We hope that more charity shows              (hold) to raise money for Project Hope.

5. John              (chat) with his son while his wife was cooking in the kitchen.

OSIRM中，负责将需要传送的二进制比特流形成一定格式的数据帧的层是（）

A.物理层 

B.数据链路层 

C.网络层 

D.传输层