I knocked on the door several times but _______________ answered, so I left.
---Who is the tallest boy? ---It ______ be John.. John is of medium height.
---Is your father a teacher? ---Well, he ______. But now he works in a bank.
---_____do you tell him the news? ---By _____an e-mail.
David comes from______ America and he is ______honest boy.
Miss Zhao teaches_______ English. We like_______ class very much.