用所给单词的适当形式填空。   

1. I'll strive _____ (improve) my spelling.

2. He didn't come to school because of his _____ (ill).

3. There are some _____ (piece) of paper on the desk.

4. Look, Lily, the word "green" _____ (spell) "gren" by you.

5. He is my English _____ (teach).

6. I have some good _____ (friend).

7. We usually _____ (go ) to work at 7:00.

8. Class was over. All the students _____ (get) out of their classroom.