1) He ______ write fast when he was young. a) couldn't b) shouldn't 2) I _____ swim in the dangerous lake because there are snakes. a) shouldn't b) mustn't 3) I _____ study for my test because I want to get a good grade. a) can b) must 4) You ______ wear a hat when you go to the beach. a) should b) could 5) Sara _____ ride a bike when she was three years old. a) could b) must 6) ______ you help find my mother?  a) Would b) Should 7) I am looking for the guard. I _______ find him. a) couldn't b) can't 8) She _____ help her mother cook because she is a chef.  a) can b) must 9) My mother always tells me that I ______ eat a lot of sweets. a) shouldn't b) can't 10) According to my doctor, I ____ eat fruit and vegetables. a) could b) must 11) I will be home next week. I ____ wait to meet you. a) mustn't b) can't

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