根据句意填空。
1. I can't pass the English exam. I f_________ very sad.
2. You must listen to the teacher _________ in class.
3. Listen! The old man is _________ what's happening to the house.
4. I can't find my key. It is _________.
5. There is snow all _________. Please clean it.
6. Fish can't live _________ water.
7. My father is _________ about my study. He is afraid I can't go to college.
8. Grandma Li is walking in the _________ park.
9. The children is having a _________ time on the playground now.
10. Mrs. Wang is _________ of cooking dinner.