用所给词的适当形式填空。

1. Thank you very much for              (help) me so much.

2. When I             (walk) in the street, I             (meet) him.

3. Liu Hua             (buy) a grammer book yesterday.

4. His son             (study) English in England last year.

5. Can you finish             (do) your homework at 10?

6. They             (go) out for a walk if it doesn't rain.

7. He             (say) he will go to Beijing.

8. They             (do) their lesson this time yesterday.

9. Mr Smith wanted             (have) his holiday in London.

10. He             (not watch) TV every day.

为了探究环境因素对植物光合作用强度的影响，某学习小组做了相关实验，结果如下：（以氧气释放量来表示光合作用强度，氧气释放量越多，光合作用强度越大）

（2）请在图中边坐标系中画出氧气释放量与温度关系的曲线图：

（3）从表中的实验结果得出的结论是______

（4）影响光合作用的因素还有很多，请你选择其中一种因素进行探究，写出简单的实验设计思路．