--- You look unhappy. What’s wrong with you?  ---I scored _______points in my class.

There are many supermarkets in this town, but we think this is _______ of all.

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

We should eat ________ fruit and vegetables, but ________ meat. It is good for our health.

—If there are _________cars, there will be _________air pollution. —Yes. And the air will be cleaner.