Is there_____ beef in the fridge— No, there isn’t. There is ______ pork.

I wonder how much you charge for your services．— The first two are free _______the third costs $30

Yesterday I wrote _____ letter to my teacher.

This is a new problem _____in the popularity of private cars _____road conditions need to be improved [ ]

Why don’t you go out to play, Rose—I’m afraid I can’t. I have much homework _________.