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L4_U6_MODAL VERBS

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  • Please ___ leave rubbish in the mountains when you go hiking.
    don't
  • ____ leave rubbish on the beach.
    Don't
  • To keep parks clean, we ___ clean up after a picnic.
    have to / must
  • To save our trees, we ___ protect the forests.
    must / have to
  • We ____ look after the Earth and stop polluting it.
    must / have to
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