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 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.