---Have you ever _____ the Great Wall? ---Yes, I have.
There is _________ with your son’s ears. So don’t worry about him.
---David, why are you so excited?---My father has made a ______that he will take me to Tibet next month..
---How long have you lived in the new flat?---__________ 2010.
---Let’s go fishing if it ________this weekend.---But nobody knows if it ___________.
---Tom has ______ a good way to deal with his old books. He plans to donate them to poor children.---Really? That’s great.