Unless you ____ the scaffolding before climbing, it might collapse. If the weather ____ too windy, working on the roof can become dangerous. You won’t be allowed to climb the tower unless you ____ received proper training. Unless there ____ proper ventilation, toxic gases can accumulate in the septic tank. ____ you ____ the tank without a gas detector, you ____ suffocation. The worker must not enter the confined space ____ another person ____ outside. Unless you ____ the oxygen level first, it cannot be safe to go inside. You can't operate this machine unless you ____ a license. ____ you don’t secure the ladder properly, it ____ slip while you’re climbing.

Conditional clause type one and unless

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