Task 3. Choose the correct answers. 1. There`s someone at the door. It can/must be the postman.

2. Don`t worry, you don`t have to/mustn`t pay now.

3. I think you had better/would better take a pullover with you.

4. Jones could/must be president if Smith has to resigh.

5. Sorry, I can`t stay stay any longer. I have to/might go.

надо ​