Primar 5 Review unit 1 Grammar 1 and 2

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1. We ___ keep the sea clean. A. can’t B. must C. don’t

Answer: B. must

You ___ throw rubbish into the sea! A. can B. can’t C. must

Answer: B. can’t

We ___ use plastic bags at the beach. A. must B. have to C. shouldn’t

Answer: C. shouldn’t (acceptable alternative: can’t)

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