Swimming is good _____ our health, but at the same time we mustn’t forget the danger. [ ]

This novel is written in ______easy English ______beginners can understand ..

Excuse me. Do you happen to have change for a I’ve just used up all my coins.

Could you tell me something about Zheng He?–Sure. He was a Ming Dynasty explorer __ the Chinese people are proud of.

Is the girl in the red skirt your sister?—No. She is____ classmate.