1) When you take an international flight, you ___ use your passport. a) don't have to b) must c) mustn't 2) On a domestic flight, you ___ use your passport. Your identity card is enough. a) mustn't b) have to c) don't have to 3) During take-off and landing, you ___ keep your seatbelt on. a) don't have to b) must c) mustn't 4) You ___ make phone calls during the flight. a) must b) don't have to c) mustn't 5) You ___ turn off your mobile phone. You can use the flight mode option. a) don't have to b) must c) mustn't 6) When you enter some countries you ___ need to fill out a landing card. a) may b) must c) have to 7) And sometimes you ___ a visa too. a) need b) have to c) must

Must vs Have to

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