Mr. Chen is a teacher and works very hard . _____ his wife .
I didn't know _____ you were getting on well with your work.
Mr Black _____ his wife to teach their child a lesson. So he did.
I took them _____ because I didn't know which was the best.
—Are you going to watch the game? —I'm sure _____ ,for it promises to be a close one.
—The problem isn't difficult for the children to work out, is it? —_____ . Perhaps they should have been given a more difficult one.