根据汉语提示填写单词。
1. The music ________(听起来) like birds singing.
2. If you get a ________(机会) to go there, please take it.
3. The little boy was _______(惊讶) at the beautiful fish he could see in the sea.
4. The sign here ________(警告) you not to smoke.
5. It' s not ________(允许) to take the books out of the classroom.
6. The story happened a few ________(世纪) ago.
7. These days the workers are busy ________(生产) this kind of medicine.
8. His parents always ________(鼓励) him to study hard.
9. Tom is very ________(自豪) of his new car.
10. His son is living ________(国外) now.
