—Well, that was really a good meal. I _______ you were a really good cook.—Thank you.

Don’t call me at three to four o’clock this afternoon. I          the patient at that time.

If  we ___________some measures, we might have prevented the environmental pollution.

Tony ________ for the company as an engineer for two decades. Now he teaches mechanics in Peking University.

It is the first time that Michel _______ the Summer Palace.