根据首字母或汉语提示，补全单词。

1. I _______ (参加) you for breakfast this morning.

2. My mother is making soup. It smells _______ (香).

3. They enjoyed _______ (种) vegetables.

4. He won. We are p_______ of him.

5. I built one of my rockets m_______ at home.

课本上“研究决定电阻的大小的因素”的实验，是利用了导体的电阻越大对电流的阻碍作用就越大这一现象来进行研究的．实验时，要保持______不变．当导体的______越大时，通过导体的______越小．