1.- I want this letter typed, but you ...................... do it today. Tomorrow will do. 2.- You ....................... make your own bed. The maid will do it. 3.- We ........................... open the lion’s cage. It’s contrary to zoo regulations. 4.- Police notice: ‘Cars ...................... be parked here’. 5.- You ................... smoke in a non-smoking compartment. 6.- You .............................. go to the shops today. There’s plenty of food at home. 7.- Church notice: ‘Visitors .................. walk about the church during a service’. 8.- Mother to child: ‘You .................. play with matches’. 9.- You ........................ clean the windows. The window cleaner is coming tomorrow. 10.- You .................... carry that parcel home yourself; the shop will send it. 11.- You ...................... take anything out of a shop without paying for it. 12.- You .................... put salt in any of her dishes. She’s got high blood pressure. 13.- We ........................ make any more sandwiches. We’ve got plenty now. các từ cần điền đây ạ MUSTN’T – prohibition DON’T HAVE TO – lack of obligation NEEDN’T - lack of obligation from speakers view

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