1) You ______ ________ _______ apologize, it's not necessary. a) don't have to b) doesn't have to 2) We ____ _____ ____ wear a tie today.  a) don't have to b) doesn't have to 3) She ____ _____ buy new clothes. a) has to b) have to 4) She ______ _______ _____ buy a new watch. Her watch is great. a) doesn't have to b) don't have to 5) You _______ ______ drive slower than 110 km/h on highways. a) has to  b) have to  6) You _____ ___ wear uniform in class. a) has to b) have to 7) My brother _______ ____ drink milk before going to bed. a) has to b) have to 8) He _____ ___ be there at 7:00p.m. a) has to b) have to 9) He _____ ___ work on Sundays. a) has to b) have to 10) They _______ ________ wake up early tomorrow.  a) have to b) has to 11) I _____ ____ stop smoking. a) has to b) have to 12) She _____ ______ _____ learn Chinese. She can communicate in English. a) doesn't have to b) doesn't has to 13) We _____ ______ ____ buy an egg. We have one. a) don't have to b) doesn't have to 14) He _____ ____ __ pick me up at the station. a) doesn't have to b) doesn't has to 15) They _____ ____ __ wear a suit. a) don't have to b) doesn't have to

Have to, Has to, Don't have to / Doesn't have to

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