根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。

1. You must keep it as a _____. It's only between you and me (秘密).

2. They taught _____ how to chat online when they were 8 years old (他们自己).

3. Kitty likes reading books _____ her sister likes watching TV (然而).

4. The government always _____ enough food and clothes for the people in poor areas (提供).

5. The _____ of such a good friend made us all sad the whole day (丧失).

6. He was badly ill yesterday, and he is even _____ today (bad).

7. As we all know, swallows fly to _____ countries in summer (north).

8. He is a _____ boy. He often tells lies and no one likes being friends with him (honest).

9. We always have a great time _____ with each other during lunchtime (chat).

10. What a _____ cold day it was yesterday! No one went out for a walk (terrible).

在一个中断和灾难事件中，以下哪一项提供了持续运营的技术手段？（）

A.负载平衡

B.硬件冗余

C.分布式备份

D.高可用性处理