---- What’s wrong with him? ---- He doesn’t feel very well. The doctor _______ just now.
We believe scientists will a way to solve the problem of air pollution.
You had better _____ home at once . Don’t keep your mother _____ .
Remember ______ the book in time when you have finished _____ it .
It willabout half an hour to get to the zoo by bus.
Tom, together with his parents the yard when I saw him.