You must wear boots in the jungle.. - Boots must be worn in the jungle.., We must save water. - Water must be saved., Specialists always have to check safety equipment.  - The safety equipment always have to be checked.., When volcano starts to erupt,we can't stop it.  - When volcano starts to erupt, it can't be stopped. , You must wear a headlamp in an underwater cave. cave - A headlamp must be worn in an underwater cave.., You musn't enter dangerous places alone.. - Dangerous places musn't be entered alone.., Scientist have to study new species in a laboratories.  - New species have to be studied in a laboratories., Underwater gases fill the air. - The air is filled with underwater gases.,

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