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 , We___have a picnic tomorrow if the weather is bad., may not, may, mustn't, You___ be careful when you sit near the campfire., may, may not, must.

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