用所给短语的适当形式填空（可重复使用）。

go on, hang up, ring up, pick up

1. He told me not to           . He'wanted to take my message.

2. Why have you stopped?           with your work !

3. How many people have     _    while I've been out?

4. She          her bag,and left the room in a hurry.

5. When you've finished those questions,   _    to Page 40.

The question is so difficult that ______ students can answer it.

A. few              B. many               C. most