It’s 10:30 pm now. Let’s stop ______ and go to bed.

stingly in some parts of the world, womenare expected to earn money _____ men work at home and raise their children

It is rather cold here. Shall we light a fire? — No, we______because things are easy to catch fire.

The story happened ________ a cold morning ________December.

Since we have failed many times, we should take a new approach ______ the problem.