• Optimise B1 - U5 and U6
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  • You ______________ go to the Bank. I have 10$ to pay the present.
    don't have to / don't need to
  • I'm sure that _________ be true, he hasn't studied for the test.
    can't / mustn't
  • She ___________ be at school because I haven't recived any notificatiob.
    must / have to
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