gas

燃烧的天然气形成巨大的火炬。

Burning ___gas creates a massive torch.

气球里充满了气体，所以它能飘在空中。

The balloon is filled with ___gas, so it can float in the air.

氧气是一种无色无味的气体。

Oxygen is a colorless, odorless ___gas.

我们家用燃气做饭。

We use ___gas for cooking at home.