Tom has been absent for two days．Do you know what _________ to him?

Our country will try to make greater progress in improving people’s living conditions，________low-income families

You’d better here the heavy rain.—Yes, That’s the traffic rule.

Mr Obama, who appeared to take the lead in the race in most battleground states, seemed to______ an air of caution throughout the first Presidential debate

My cousin went to Canada two years ago. He ____there for a few months and then went to America.