I think he is taking an active part in social work.–I agree with you ____.

Pity you missed the lecture on nuclear pollution.—I _______ it ,but I was busy preparing for a job interview.

I didn’t go swimming yesterday afternoon.— ______________. I had to clean up my bedroom.

How do you deal with the disagreement between the company and the customers–The key ________ the problem is to meet the demand _______ by the customers.

was always ______ his best in any danger, but at that moment he froze.