用所给词的适当形式填空。

1. You are a good _____ (listen).

2. What would you do if the teacher _____ (ask) you to give a speech?

3. The old man is very _____ (energy).

4. Don't be afraid _____ (speak) in the front.

5. The man is very _____ (confidence).

6. The coach asked the boy _____ (not run) too fast.

关于三种备份方式：完全备份、差量备份和增量备份的联系和区别，下列说法错误的是______。

A．完全备份较之差量备份，所需要的资源和时间较多
B．差量备份比增量备份需要更长的时间
C．差量备份与增量备份混杂使用，可能会造成文件丢失
D．差量备份恢复时间较增量备份短