The boy had the presence of mind to turn off the gas.

那男孩子镇定地关掉了煤气。

《牛津词典》

She often forgot to turn off the gas and the food she was cooking usually got burnt.

她经常忘记关煤气，她做的饭经常烧糊了。

youdao

She was intelligent enough to turn off the gas.

她关掉了煤气, 够机灵的。

《新英汉大辞典》

"Someone could attack the industrial control systems that control all the valves, all the distribution systems, and are used to turn on and off various aspects involved with energy and the electrical power grid and oil and gas distribution networks,".

VOA: standard.2009.08.11

The crudest is simply that in some future and unpredictable crisis Russia could turn off the gas and Europe would freeze.

BBC: Europe diary: The gas man

The kettle was whistling now, and I thought to leave it, so that Sall would have to get up and turn off the gas.

NEWYORKER: The Cold Outside

Do you know how to turn off the utilities (gas, water and electricity) at the main switches?

FORBES: Are You Prepared for a Disaster?