1) Volcanoes ___________________ shortly before they happen.  a) can be predict b) can predict c) can be predicted d) can predicted 2) Safety guidelines ___________________ when entering the cave. a) must follow b) must be follow c) must followed d) must be followed 3) Mountain climbers _________________ a rope on the mountain. a) should use b) should be used c) should used d) should be use 4) A headlamp ___________________ when exploring underwater caves.  a) has to be worn b) has to wear c) have to be worn d) have to be wear 5) Explorers _________________ their safety equpiment carefully. a) must be checked b) must checked c) must be check d) must check 6) Wildlife scientists sometimes _____________________ rivers and streams to discover new animals or plants. a) have to be crossed b) have to crossed c) have to cross d) have to be cross 7) Caves ________________ by day or night. It depends on how adventurous you are!  a) can explored b) can be explored c) can explore d) can be explore 8) Dangerous risks _______________________ at all times. a) must avoid b) must avoided c) must be avoided d) must be avoid 9) Extreme caution ___________________ when entering the jungle. a) must be taken b) must taken c) must take d) must be 10) Teachers _________________ their students to be curious and ask questions about the world. a) must encouraged b) must encourage c) must be encouraged d) must be encourage

Passive with modals

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