【题目】The old man lives in a house that ________ out of the stones.

【题目】I was doing homework ________ the phone bell rang.

【题目】Many old houses around our school will be ____ down next year and a large green area will appear.

【题目】—Is that your teacher?

【题目】—It's difficult to get to the other side of the river.

【题目】My father taught me ________ the guitar last summer.

【题目】The film had ________ for ten minutes when I ________ to the cinema.

【题目】________, our school trip was very excellent.

【题目】It is difficult for us ________ a cow though it looks easy for my grandpa.

【题目】— How long can I ________ the book?