are lots of rules about good manners, but the ________ idea behind them all is this: Treat people the way you wish they would treat you.

er I met her，________ was fairly often, she greeted me with a sweet smile.

The new online library makes possible for students to choose books by smart phone off campus．

the books onthe desk, ______ is of any use for study

__ __Joe saw the film ‘ET’ directed by Steven Spielberg ,he made up his mind to turn ____ director ,too