I had been working on math for the whole afternoon and the numbersbefore my eyes

The father _____his son to buy him a car if he goes abroad to further study.[ ]

It is no ________ pretending you did not know because everyone saw the whole accident

__________ do you exercise—Every day.

Do you think the phone is genuine(真品)? —I don’t think it ______ be a fake, as this shop has a very good reputation.