Volcanoes ___________________ shortly before they happen., can be predict, can predict, can be predicted, can predicted, Safety guidelines ___________________ when entering the cave., must follow, must be follow, must followed, must be followed, Mountain climbers _________________ a rope on the mountain., should use, should be used, should used, should be use, A headlamp ___________________ when exploring underwater caves., has to be worn, has to wear, have to be worn, have to be wear, Explorers _________________ their safety equpiment carefully., must be checked, must checked, must be check, must check, Wildlife scientists sometimes _____________________ rivers and streams to discover new animals or plants., have to be crossed, have to crossed, have to cross, have to be cross, Caves ________________ by day or night. It depends on how adventurous you are!, can explored, can be explored, can explore, can be explore, Dangerous risks _______________________ at all times., must avoid, must avoided, must be avoided, must be avoid, Extreme caution ___________________ when entering the jungle., must be taken, must taken, must take, must be, Teachers _________________ their students to be curious and ask questions about the world., must encouraged, must encourage, must be encouraged, must be encourage

Passive with modals

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