Dangerous places _____________ alone., must be entered, must not be entered, must be enter, Headlamps _________ in dark caves., must be worn, must be wore, must be wear, They __________ underwater., can't be analyzed, can be analyze, can be analyzed, New species ___________ in a science lab., have to be study, have not be study, have to be studied, people ________ because when a volcano starts to erupt., must be help, must be helped, may be helped, Rocks _______ from inside the volcano., have to be collected, have to be colected, have to be collect, As scientists descend by rope, the sound of gases ______ below., can, might, can he heard, Rubber shoes ________ because they melt in heat., shouldn’t be used, shouldn’t be use, should be used, Volcano ______ when it erupts., can be stopped, can’t be stop, can’t be stopped, The safety gear _________., shouldn’t be checked, have to be check, have to be checked

Passive with Modals

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