A(n) is a person who sees something happen and can describe it to other people.

He was asked to _______the facts just as he remembered them.

Oh, I had a terrible toothache.——You’d better see a dentistand have your bad teeth out.

She always watches her son ________ the road everymorning, or she will feel worried.

Our society insists on regular habits, timekeeping and punctuality, and whether we like it or not, ______ we mean to make our way in society, we have to comply ( to act in accordance with a demand, rule, etc.) its demands