Помогите пожалуйста если не трудно…

Помогите пожалуйста если не трудно 13. Sam really ___ to pay more attention during lessons. a) ought b) should c) might14. You ___ expect me to know everything! a) have to b) can't c) must15. You ___ to use your mobile phone on an aeroplane.a) aren't allowed b) can't c) don't have16. Let's ask Eleanor — she ___ know.a) can b) shouldn't c) might17. I ___ see you later if I finish work on time.a) can't b) might c) must18. He ___ to get there before we do.a) is bound b) must c) is able19. ___ attend the meeting? a) Must I b) Do I have to c) Am I20. You ___ pay for the hotel room. Your company has already paid.a) can't b) don't have to c) mustn't