—Chinese people are worried about the food they eat these days.—Yes, the food safety is a serious         in our country. We should try to solve it.

The restaurant is so popular here. Look, there are so many _____ here.

This isn’t my sister’s skirt. ______ is blue.

I used to     in Tibet , but now I am used to        in Beijing.

Does Zhao Ping ___ his father or his mother?