1.
B It must be from Paul.
2.
B You should go to the dentist.
3. B It should be upstairs.
4. B I have to do my homework.
5. A Would
you babysit for me tonight?
6. C You needn’t have done the
washing up.
7. C
John can’t have watched it.
8. A You mustn’t keep pets in
the flat.
9. C Shall I open the door for you?
10. B You needn’t do the shopping.