Choose the correct option, a; b or c to complete the sentences

1.
Choose the correct option, a, b or c to complete the sentences.
sit here, or do you want me to sit somewhere else?
b.Shall I
a. Could you
2. I don't think you've understood this.
a. If I were you
3. We need to talk about our presentation.
b. How about
a. Why don't we
4. That's not very nice way to talk to other people.
b. You shouldn't
a. Is it all right if I
5. Mrs Allan is leaving at the end of term.
b. Would you mind
b. We don't have to
a. Let's
6. I don't think I can do this on my own.
a. Would
you
like
7. Parking in this street is prohibited.
a. I think you should
look at Unit 12 again.
b.I think you should
b. You mustn't
8. I'm sorry I haven't got my homework.
a. Do you mind if I
b. Shall I
c. Why don't we
c.I think you should
meet after school tomorrow?
c. Do we have to
speak like that.
c.I don't think you should
buy her a present.
c. Why not
helping me?
park here.
c. Do you mind
c. You don't have to
forget it again?
c. Why don't we