( )(4) 当你不赞同对方想法时,应说:A. I don’t know . B. I don’t think so .
You must wait ________ the green light .
Do you help you mum _______ the housework?
Is your little sister getting up? _____No, she ________ .
He _______ never late for school . A.be B.is C.are
_______ you good ________ drawing ?