拼写单词，根据句子意思，在空格中填写适当的单词，使句子完整、正确。

1. Do you mind if I open the window? Not in the _______. Please do.

2. There are five _______ on each hand.

3. I won't read that kind of books. It's a _______ of time.

4. How do you get along _______ the new students?

5. You should think it over before you make the _______.

6. I've written several letters to him, but he _______ to none of them.

7. Don't _______ about him. He is already fifteen years old.

8. The homework isn't difficult at all. You can _______ finish it before 5:00 pm.