It rained yesterday. And we stopped playing basketball ______ the rain.[ ]

You will have an accident if you don’t ______, for the road is icy.

_________trees have been planted near, so the air is very fresh.

Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.

You know a lot about Chinese history, don’t you?–Yes, I ___________ China for a long time since 1998.