John found it a challenge to meet the needs of the boss. __________, he had no way to satisfy him.
The young man insisted that he _____ nothing wrong and _____ free.
He is talking so much about America as if he _____ there.
________ is impossible for us to offer him any help.
So excited was the winner that he couldn’t say any word to his feelings.
How dirty the floor is! You should have someone _____ it at least twice a day.