21．这颗新星是一位中国科学家发现的。   
    The new star______________________.
22．他给我们提供了一条有用的信息。
    He gave us_______________________.
23．请立刻给我带两瓶牛奶来吧。
    Please____________________________ at once.
24．你们最好不要在大街上踢足球。
    You'd better____________________________.
25．他已被派到西藏(Tibet)工作去了吗7 
    ________________________ in Tibet?
26．教育上已取得了很大的成绩。

    Great changes__________________________________.
27．不要嘲笑那些遇到麻烦的人。
____________________________ those who are in trouble．
28．我把窗户关上你不介意吧?
____________________________ the window?
29．做完作业后，他又接着给父母写了一封信。
    After he finished his homework, he_____________________.
30．他用了三周时间看完了这本书。
    It took him__________________________________________.
31．不要躺在床上看电视，这对你的眼睛有害。
    Don't watch TV in bed．It's___________________________________.
32．从那以后我不再是个学生了。  
   After that I was____________________________.
33．我朋友因唱歌而出了名。
   My friend____________________________.
34．你吃得越多，长得越胖。
    The____________________________ will be．
35．他告诉了我，我才知道这件事。
    I knew nothing____________________________.
36．你能告诉我从上海到北京乘火车需要多长时间吗?
    Could you tell me_____________________ ?
37．从北京到上海的单程票价是多少?
    What's the____________________________ ?
38．我不仅会说英语，而且会说法语。
    I can____________________________.
39．他给我们讲了那么多有趣的故事，我们都哈哈大笑。
    He told us such funny stories_____________________.
40．那城市的变化使他们感到惊奇。
    They_____________________ in that city.

Key：

21. was discovered by a Chinese scientist
22. a useful piece of information
23. bring me two bottles of milk
24. not play football in the street
25. Has he been sent to work
26. have been made in education
27. Don't laugh at
28. Would you mind if I shut
29. went on to write to his parents
30. three weeks to finish reading the book
31.. bad for your eyes
32. no longer a student
33. is famous for his singing
34. more you eat, the fatter you
35. about it until he told me
36. how long it takes by train from Shanghai to Beijing
37. price of a one-way ticket from Beijing to Shanghai
38. speak not only English but also French as well
39. that we all laughed
40. were amazed at the changes