根据首中文意思用适当的形式填写句中的单词。

1. What __________ (有乐趣) it will be when we all go on holiday together!

2. __________ (一旦) he starts to do something, he won't stop until it is finished.

3. After __________ (毕业) from college, we finally got the chance to take a bike trip.

4. When the nights were warm, I stayed awake on __________(故意) until very late to see the moon.

5. She __________ (遭受) from loneliness when studying abroad.

6. I told him I was sorry, but he didn't seem to __________about (在意) it.

7. The little boy is so __________ (吓坏了) that he cries for his mum.

8. My grandpa is __________ of (喜欢) fishing and sometimes he fishes all day in the river.

下列气体易液化，遇挥发性酸时冒白烟，而且适宜作制冷剂的是（   ）

A．Ｎ_２

B．ＮＨ_３

C．ＮＯ

D．ＮＯ_２