1)We................................ take a bus to the school. It’s too far to walk. A. have to B. must C. may D. ought 2)You................... be very tall to play football. A. don’t have to B. mustn’t C. may not D. can’t 3)Cigarettes ________ at a bakery. a. most buy b. cannot buy c. cannot be bought d. should not buy 4. All traffic laws ________. a. is observed b. must be observed c. must have observed d. had better observe 5)This letter ________, not handwritten. A. Should be typing b. should be typed c. needn't type d. needn't be typed 6) Fruits ________ in a freezer. a. should not put b. should not be put c. must put d. must be putting