You ___ be quiet in the library., mustn't, must, can't, It ___ rain this afternoon, so take your raincoat just in case., may, may not, must, I ___ swim very well., must , mustn't, can, You ___ pick flowers in the national park — it’s not allowed., mustn't, must, may, You ___ throw rubbish into the bins to keep the park clean., must, mustn't, may not , Children ___ play near the river without an adult., must, mustn't, may not, You ___ be careful when you use the campfire., may , may not, must, We ___ have a picnic tomorrow if the weather is bad., may not, may , mustn't.

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