一 Mom,what did your doctor say? 一 He advised me to live _____the air is fresher. [ ]

I don’t mind playing against a beginner，like myself，but I’m not going to _____ someone who has been playing chess for years．.

_______ do you want to be a newspaper reporter—I can talk to many interesting people.

Who listens ________, Tom, Jack, or Bill

The river that is seriously polluted is________ danger to the villagers.