Ответ:

2. ...should talk...

3. ...mustn't eat...

4. ...shouldn't talk and eat...

5. ...mustn't use...

Объяснение:

Ответ:

It isn't OK to talk in the library

you must be quiet in the library

It's against the rules to eat sandwiches in the classroom.

We mustn't eat sandwiches in the classroom

It isn't a good idea to talk and eat at the same time

You shouldn't eat and talk at the same time.

You can't use your mobile during a test

You mustn't use your mobile during a test

Объяснение:

сорри если не правильно