根据句子意思及首字母补全单词。

1. What he said sounds impossible, so I d_______ with him.

2. Bob has to s_______ up until 11 pm for his math test.

3. After such a long journey, Tina got really t_______.

4. John has got his driver's l_______. He can drive now.

5. Don't make friends with that s_______ boy.

6. On Friday afternoons, many students are s_______ after a long week of classes.

7. Being a volunteer at a hospital may be a good e_______ for him.

8. He is a running star, his parents have watched him in every one of his r_______.

9. If you work hard, you will s_______ at last.

10. —What's the result?

     —My mother will make the d_______.

化学科代表和林民同学帮助实验老师整理化学药品室．发现分别放在两个试剂瓶中的两片用砂纸磨得光亮的银白色金属片，未贴上标签．到底它们是哪两种金属？两位同学首先对这两种金属X和Y的金属活动性顺序进行实验探究．

（1）进行猜想：①科代表猜想：活动性X大于Y

②林民同学猜想：活动性Y大于X

（2）设计实验方案、进行实验，获得结论．完成好如下实验报告，并回答后续有关问题．

（4）实验老师经实验分析得知制得的Y粉末中含有未反应完的X粉末，同学们决定用化学方法将杂质X粉末除去，两个同学经讨论、交流一致认为可选用的除杂试剂是：______．