二、完型填空：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项将其补充完整。
Filing means keeping documents in a 1 place and being able to find them easily and quickly. Documents that are 2 will not easily tear, get lost or dirty.
A filing system is the central record-keeping system for an organization. It helps all people who should be able to access information to do so easily. It is always 3 when someone looks for something and is able to find it without difficulties. In our organizations we work in groups. We receive and send out documents on different subjects. We need to keep these documents for 4 reference. If these documents are not cared for, we cannot account for all our organizational activities. Everyone who needs to use documents should know 5 to get them.
A. clean B. secret C. safe
2. A. cared for B. caring for C. care for
3. A. a luck B. a pleasure C. a fun
4. A. future B. past C. historic
5. A. when B. why C. where
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