------Which do you prefer to live in, the city or the countryside? ------Of course in the countryside. The air is much _________.

—How about the dishes?—Fantastic! Nothing tastes _________.

I think PE is one of______subjects of all.

—You see, “Food Safety” receives thousands of Internet hits a day. —Yes, it becomes one of the _________ topics(话题) these days.

Lucy is the________ of the twins, and she is the_______ girl in her class.