1) The girl (can, should) read books non-stop. CLUE: The purpose of the sentence is to state the subject's ability; so, which should you choose? a) can b) should 2) People (could, must) do better at protecting the environment. CLUE: The purpose of the sentence is to state an obligation. a) could b) must 3) Mister, (do, may) I carry your bag? CLUE: The sentence aims to ask for permission. a) do b) may

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