Amazing ! You wearslippers at work .—- Don’t you know it’s a fashion

(2013·哈尔滨四校高三统一检测)In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.

The light in the office is still on. —-Oh, I forget ______.

I’m afraid that sweater is too expensive__________.

We had ______ one-day holiday on New Year’s Day this year.