—— Was the driving pleasant when you went to Mexico last summer? —— No, it ＿＿＿＿ for four days when we arrived, so the roads were very muddy. 

You have failed to do what you        to and I'm afraid the teacher will blame you．

-------- The window is dirty. --------- I know. It __________ for weeks.

The Chinese government has made great efforts to ______ the gap between the rich and the poor, but has not achieved obvious results.

---The president _____ by his doctor today that his cancer has come back.