Why many adolescents (青少年) have trouble communicating with their parents lies in _____we call “generation gap.”

He is organized and is often . I hope he will have more at his business.

Mr Smith _____ his living by teaching ten years ago and he _____ greatly from his work.[ ]

Lisa, don’t let ______ in. I’m too busy to see ______ all the morning. —OK. I ______.

Li Lei can ___ Chinese kung fu.