对我们来说节约能源很重要。

It is important for us to save ___energy.

我们绝不能浪费能源。

We mustn't waste ___energy.

我考虑过买空调，但它消耗太多能源，所以我打算买风扇，因为这里很热。

I considered buying an air conditioner, but it uses too much ___energy, so I'll get a fan since it's very hot here.