根据句意及首字母提示完成单词拼写。

1. All of us are s______ to hear that bad news.

2. I lost my knife. I looked for it e______ but I can't find it.

3. The window is b______. We need to repair it.

4. It's too dark in your study. Please turn on the table l______.

5. Today many things are made of p______, for example, bottles, plates, bowls and so on.

冷芯盒用聚异氰酸酯的加入量为（）%。