3. Choose the correct options.
1. I need some emails.
a) to answer b) answer c) answering
2. The situation is difficult _ __ .
a) for explain b) explain c) to explain
3. I don't know what
a) do b) to do c) that I do
4. I don't really mind ___ housework.
a) do b) to do c) doing
5. is one of the best forms of exercise.
a) Swimming b) Swimming c) Swim
6.___ bring our books tomorrow?
a) Do we have to b) Have we to c) Do we must
7. It's free. You pay.
a) don't have to b) mustn't c) haven’t to
8. You must ___ your grandmother.
a) to call b) calling c) call
9. You drink so much coffee.
a) not should b) don't should c) shouldn't
10. I think you should ___ to her about it.
a) to talk b) talk c) talking