4 Choose the correct option. 1 I'm going to China soon. I must/ don't have to buy a guidebook.
2 You can never find your passport. You should / shouldn't put it in a safe place.
3 Do we have to / Should we get a visa for the USA?
4 The plane leaves at 9 a.m., but we mustn't/ don't have to be there until 7 a.m.
5 I shouldn't / ought to pack my bags. We leave in an hour.
6 It's going to be very hot at the beach. We must / mustn't forget the sun cream.