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Must, Might, or Can’t?

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  • It’s 8:00 a.m. and she’s not here yet. She ______ be late.
    must
  • He’s laughing really hard. It ______ be a comedy show.
    must
  • She has tears in her eyes. She ______ be sad.
    must
  • They ______ be best friends. They always sit together.
    must
  • This place is so fancy — it ______ cost a lot to stay here.
    must
  • That ______ be Maria’s voice. It sounds very different!
    can't
  • She says she’s 18, but she looks 12! She ______ be 18.
    can't
  • You ______ be serious! That’s the funniest thing I’ve ever heard.
    can't
  • He ______ be the new student — I’ve never seen him before.
    might
  • There’s someone at the door. It ______ be the pizza delivery guy.
    might
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