—You seem tired, David.—Yes. I _____ all day long and can’t wait to go to bed now.
Recently I bought an ancient Chinese vase,________ was very reasonable.
Mr. Smith is _______ a teacher. He is a friend as well. We all respect him.
The story happened in________ and the hero was in his________.
Can you tell me the way you think of________ the problem?
As a new graduate,he doesn't know ________it takes to start a business here.