根据句意和所给首字母，在句子空白处填入适当的单词。

1. Everyone should care for wild animals in d_________.

2. His book is very thick(厚的)，but mine is t_________.

3. Our h_______ is becoming more and more beautiful.

4. She always gets n________ before a big exam.

5. You are s________ to study hard when you are at school.

6. He lives in a very poor v_______, so his parents can't afford his education.