根据短文内容及首字母提示，填写所缺单词，使短文意思完整。

A professor told his students to go into the city slums(贫民窟)to study the life of 200 boys . He asked them to w (86) reports about each boy”s life and future . Every one of the students wrote , “ He doesn”t have any hope . ”

Twenty-five years I (87) , another professor read about the earlier study . He told his students to f (88) out what had happened to the boys . They tried very hard and found that 176 of the boys had become successful a (89) doctors , teachers and scientists .

The professor was very s (90) and decided to study it further . Luckily , all the men were living near the place and he was able to ask each one , “ What made you s (91) ? ” Each one answered , “ There was a teacher . ”

The teacher was s (92) living there , so the professor found her and asked the old women w (93) she had used to pull those boys out of the slum , and c (94) them into successful people .

The teacher”s e (95) began to shine and said with a sweet smile , “ It”s really very easy . I loved those boys . ”

根据对话内容，在每小题的空白处写出一个完整的句子，使对话意思完整。

John：Oh , Tom . Please don”t sit on this chair !

Tom： (81) ?

John：Look ! One of its legs is broken . It”s dangerous to sit on it .

Tom： (82) . Who”s broken it ?

John：I don”t know . I found it this morning when I was cleaning the floor .

Tom：Let”s tell our teacher about it and then someone can repair it .

John：No . (83) .

Tom：Yourself ? Have you learnt to repair a chair ?

John：Yes . My father is a worker . He”s good at repairing things . (84) .

Tom：Oh , your father taught you . (85) ?

John：Certainly . Let”s begin .

5. 你什么时候还这笔钱。

When did you (79) (80) the money .

4. 人口的增长也许是当今世界最大的挑战。

The increasing population may be the (77) (78) .

3. 这件事情我以前听说过。

I have (75) (76) it before .

2. 查一下你们是否都有飞机票。

(73) (74) you”ve got the air tickets .

根据汉语意思完成下列句子，每空只填一词。

1. 张老师准是在办公室里。

Mr. Zhang (71) (72) in the office .