用所给单词的适当形式填空。

1. Mum wants me _______ (drink) milk every day.

2. Bill likes _______ (play) basketball.

3. I try _______ (be) a good student.

4. Katrina often helps Bill _______ ( study) English.

5. You must _______ ( finish) your homework.

6. There is much _______ ( milk) in the bottle.

7. There are some _______ ( vegetable) in the basket.

8. Most students have good _______ (habit).

9. I have a _______  (difference) idea.

10. Lin Ying reads English books _______ (two) a week.

一棵二叉树结点的前序序列为A、B、D、E、G、C、F、H、I，对称序序列为D、B、G、E、A、C、H、F、I，则该二叉树结点的后序序列为______。