1) You ............................. apologise; it isn't necessary. a) have to b) must c) don't have to d) mustn't 2) You .................................. tell the boss what happened, or he'll fire you. a) have to b) must c) don't have to d) mustn't 3) I .......................................... wear a tie; I do it because I like wearing ties. a) have to b) must c) don't have to d) mustn't 4) You ...................................smoke in here; smoking is not allowed. a) have to b) must c) don't have to d) mustn't 5)  We ...................... be quiet. a) have to b) must c) don't have to d) mustn't 6) Children ................................ go to school. a) have to b) must c) don't have to d) mustn't 7) She................................ work from monday to friday. a) has to b) must c) doesn't have to d) mustn't 8) You ........................ wear a helmet if you ride a bike on the road. a) have to b) must c) don't have to d) mustn't 9) You ................................ use your phone on the plane. a) have to b) must c) don't have to d) mustn't 10) I ................................... recycle those papers. a) have to b) must c) don't have to d) mustn't

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