6. A. business B. children C. work D. office

5. A. interesting B. same C. true D. good

4. A. because B. if C. but D. so

3. A. spend B. stay C. work D. have

2. A. friends B. teachers

C. classmates D. parents

1. A. message B. call C. report D. letter

10.B. 根据文章的意思，那时Billy一定是把树拉倒之后才藏起来的。

　(8)

　A generation gap(代沟)has become a serious problem. I read a (1)_____ about it in the newspaper. Some children have killed themselves after quarrels with (2)_____. I think this is because they don't often have a talk with each other. Parents now (3)_____ more time in the office, (4)_____ they don't have much time to stay with their children. As time passes, they both feel that they don't have the (5)______ topics to talk about. I want to tell parents to be more with your (6)_____, get to know them and (7)______ them. And for children, show your (8)_______ to your parents. They are the people who love you. So (9)_____ them your thoughts. In this way, you (10)______ have a better understanding of each other.

9.C. 根据当时的情景，这里用完成时态最合理。因为对当时来说，Mr Baker 想要了解的是到当时的情况。这正是现在完成时的用法之一。

8.D. 这里是Billy的许诺，他答应照看好这些树的，所以他才不让Mr Baker 去担心这些树。

7.B. ago 和before都表示“以前”，after表示“在……以后”，但它用在时间段之前；later用在时间段之后表示“在……以后”。