1) I think you __________ always try to do your best in school. a) should b) must 2) We __________ take things that don't belong to us. It's illegal. a) shouldn't b) mustn't 3) We __________ arrive on time for class. It's the school rules. a) must b) should 4) When there's a hurricane, people __________ stay indoors, or they could get badly hurt. a) must b) should 5) We __________ eat too many snacks because it's bad for our health. a) mustn't b) shouldn't 6) Everyone __________ eat healthy food if they don't want to get sick. a) should b) must 7) We __________ eat fruit and vegetables every day. a) should b) shouldn't 8) People __________ light fires in forests. It's a crime. a) must b) mustn't 9) My advice is that you __________ stay up so late. a) shouldn't b) should 10) You __________ be quiet in the library. It's a rule. a) must b) mustn't 11) We __________ get lots of exercise because it's good for us. a) should b) shouldn't

Should/Shouldn't - Must/Mustn't

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