根据句意，用括号中所给单词的适当形式或句子的语法要求填空

1. Nick is young and strong. He is __________(energy) all day.

2. How many __________(knife) would you like to buy?

3. Lucy doesn't like wearing the school uniform. She prefers to wear something __________(fashion).

4. He is the first person __________(land) on the moon.

5. The gravity on the earth is __________(heavy) than that on the moon.

6. Thank you for __________(give) me the picture.

7. Simon often tells funny jokes to make us __________(laugh).

8. More people are getting to know the __________(important) of environmental protection.