—You ____ have set aside more time to play with our kids.—I wish I ______, but you know how busy I was.

My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.

I was ill that day, otherwise I ____ the sports meet

The pills       him.If only he had taken them regularly.

–Do you know where David is? I couldn’t find him anywhere. – Well. He _____ have gone far — his glasses are still here.