5. Write the sentences, choosing one of the modals:
1) We are leaving tonight, so you (should/must) buy a ticket for the flight. – We are leaving tonight, so you must buy a ticket for the flight.
2) (May/Might) I come in?
3) David (can/could) cook well when he wants to.
4) 'Do you think it (can/might) rain?' 'Yes, possibly. We don't want to get wet so I think we (should/must) take our raincoats.'
5) Jenny tried to carry him but she {can't/couldn't).
6) We (can/might) visit my cousin in Australia next year but we don't know yet.
7) In many countries, you {should/must) wear a seat belt in the car - it's the law.
8) (Can/May) you hold this for me, please?
9) I know they enjoy their work but they (shouldn't/'mustn't) work at the weekends. It's not good for them. I think they (should/must) spend time at home with their families.
10) The letter (can/may) arrive tomorrow.