Perhaps the day will come ____ people willbe able to breathe clean air in cities．

When I was doing shopping last Sunday, I ______ Mr. Smith in the street.

Have you got used to the Chinese food, Robert—Yes, but I don’t like ____ when a Chinese host keepsserving me the food I don’t like.

─That’s to say，sandstorms seldom hit that area， they─No，but things are different now.

. I _____ her not to walk on the thin icebut she would not listen to me.