根据句意和汉语注释，写出单词的正确形式。

1. _____ (无论什么) decisions he made, I would agree with him.

2. It's really true that development never stops _____ (贯穿) history.

3. All children should be taught road _____ (安全) from an early age.  

4. This kind of virus was _____ (扩散) around the world in less than three months.

5. Compared with the new buildings, the old ones seem even _____ . (丑陋)