1) “Cave explorers have to use ropes” 2) “Explorers must wear satefy gear” 3) "Explorers have to wear ropes in underwater caves" 4) "Climbers should use ropes to descend steep mountains" 5) "Scientists have to study samples in science labs" 6) "Every body must follow safety rules" 7) "Experts must study volcanic activity"

7th Review Reported speech with modal verbs

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