28. 　He _____ come and worry me with questions, just when I was busy cooking the dinner.

27. The book is 　　　　　but boring; it is, in fact, rather exciting and fascinating.

26. Do you know what use people _____ trees after they are cut down?

25. The angry old man insisted this young man _____ his purse and that the real thief referred to _____ put into prison.

24. The MP4 my father bought me on my birthday isn’t missing; it still _____ where I _____ it several days ago.

23. Is it twenty years that it may be _____ his father drank last?

22. When her father fell into a serious disease, she would sit before the window with her eyes _____ at the street without thinking anything.

第一节：单项填空(共15小题；每小题1分，满分15分)

请从A, B, C, D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项的标号涂黑。

21. _____ is acknowledged to us is that Qian Xuesheng _____ great contributions to our country's agriculture.