根据句意及首字母提示填空。

1. This silk blouse is nicer than the c____ one.

2. The s____ around the girl's neck (脖子) makes her more lovely and beautiful.

3. The girl opened her h____ and took out a postcard with a British stamp on it.

4. In winter, we have to wear g____ to work in a cold place.

5. In modern s____, clothes do more than keep us warm.

真空严密性试验步骤是什么？