1) You ______ walk on the grass. a) must b) mustn't c) have to d) don't have to 2) You ______ have a ball to play golf. a) must b) mustn't c) have to d) don't have to 3) You ______ buy a ticket. I've bought one for you. a) must b) mustn't c) have to d) don't have to 4) You ______ be patient when you go fishing. a) must b) mustn't c) have to d) don't have to 5) You ______ study harder to become an IT specialist. a) must b) mustn't c) have to d) don't have to 6) You ______ take part in a competition if you don't want. a) must b) mustn't c) have to d) don't have to 7) You ______ use your phone when you are climbing. a) must b) mustn't c) have to d) don't have to 8) You ______ wear your waterproof shoes when you go hiking. a) must b) mustn't c) have to d) don't have to 9) You ______ use special equipment for doing sports. a) must b) mustn't c) have to d) don't have to 10) You ______  play video games in the evening. It's better to sleep or relax. a) must b) mustn't c) have to d) don't have to

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