• Grammar in Focus 3 Units 17-20
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  • Choose the correct word. You ( can’t / mustn’t ) fly. You are not a bird.
    mustn't
  • Choose the correct word. Cars ( must / has to ) follow the traffic signs.
    must
  • Choose the correct word. I ( don’t have to / doesn’t have to ) go to bed early tonight.
    don’t have to
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