New York is one of ____ in the world.
It’s reported that there are more than 300 smokers in China, nearly a third of all the smokers in the world.
— May I watch TV now, mum?— No, you . You must clean your room first.
Mary used to in the countryside, but now she is used to in the city.
WeChat (微信) is very popular. the young the old are getting interested in it.
You are supposed to be more careful to make fewer while you are writing.