“All of them are not fond of the film” means     “_______of them are fond of the film”.

Haze (雾霾)appears around us. Let’s do ________ helpful to protect the environment.

—Do you like ______ here?—Oh, yes. The air, the weather, the way of life. Everything is so nice.

Since many young people have become rich on Taobao.com, I wonder what        ________ is like to run a successful on-line business.

--- Who knocked the door? --- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ______ was.