六、短文填空。
阅读短文，从方框中选出恰当的单词并用其适当形式填空，使短文通顺、意义完整。每空仅填一词，每词仅用一次。
destroy cover cause librarian reason
prove unlock nobody therefore worry
Last week, an unusual thing happened in our school. The library is the favourite place for many students to enjoy different kinds of books. However, the 1. noticed that some books there were not in good condition.
When they checked the books carefully, they found that someone seemed to 2. them. Pages were torn out(撕掉), and 3. were damaged. It seemed that someone did these intentionally(故意地). The teachers asked all the students who often came to the library, but 4. knew who did this. Everyone felt sad because these books were important to them.
5. , the school decided to take action. They asked a worker to 6. the camera system in the library to find out the truth. After checking the videos from the past few days, it 7. that a group of pigeons that got into the library through an open window did these! The pigeons jumped on the bookshelves and 8. the damage with their claws and beaks.
After finding out the 9. , the school fixed the window and moved the books to a safer place. Now, the students can come there without 10. , and they can enjoy reading their favourite books again.

1. librarians 2. destroy 3. covers 4. nobody 5. Therefore 6. unlock 7. proved
8. caused 9. reason 10. worrying
8. caused 【解析】根据设空处后“the damage with their claws and beaks(用爪子和喙造成破坏)”并结合备选词可知，“cause(造成)”符合语境。且全文是过去时态，所以cause要用过去式caused。故填caused。

【分析】
首先通读短文，理解文章讲述的校园图书馆因鸽子损坏书籍，学校查明原因并解决的趣事。解题时需先明确方框内单词的词义：destroy（破坏）、cover（封面；覆盖）、cause（造成）、librarian（图书管理员）、reason（原因）、prove（证明）、unlock（解锁；启用）、nobody（没人）、therefore（因此）、worry（担心）。再结合每个空的上下文语境、词性要求、时态及词形变化规则，同时注意每词仅用一次，逐一确定答案。
【解析】
1. 此处需填名词作主语，结合语境“图书馆是学生喜欢的地方，______注意到书籍损坏”，应是“图书管理员”，用复数表一类人，故填librarians。
2. 固定搭配seem to do sth，需填动词原形，结合语境“有人似乎______书籍”，备选词destroy（破坏）符合，故填destroy。
3. 此处与前文pages（书页）对应，指书籍的“封面”，用复数形式，故填covers。
4. 结合语境“老师询问常来图书馆的学生，但______知道谁做的”，表否定“没人”，故填nobody。
5. 前文说书籍损坏，后文说学校采取行动，表因果关系，位于句首首字母大写，故填Therefore。
6. 固定搭配ask sb to do sth，需填动词原形，结合语境“让工人______图书馆的监控系统”，unlock（启用）符合，故填unlock。
7. 全文为过去时态，结合语境“检查视频后______是鸽子干的”，需用prove的过去式，故填proved。
8. 全文为过去时态，结合语境“鸽子用爪子和喙______破坏”，需用cause的过去式，故填caused。
9. 结合语境“查明______后，学校修了窗户”，指“原因”，故填reason。
10. 介词without后接动名词，结合语境“学生来这里没有______”，需用worry的动名词形式，故填worrying。
【答案】
1. librarians 2. destroy 3. covers 4. nobody 5. Therefore 6. unlock 7. proved 8. caused 9. reason 10. worrying
【知识点】
词汇运用、动词时态、名词单复数
【点评】
本题为语境型短文填空题，围绕校园生活趣事展开，既考查学生对词汇词义的理解，又要求结合语法规则（如动词形式、名词单复数、介词搭配）正确变形，能有效检验学生的综合语言运用能力，难度适中。
【难度系数】
0.5