Nick is my good friend from England. Now let me tell you something(一些事情)about him.   

    Nick is a student and he is thirteen years old.His family are in Beijing now.His father,Mr Brown,is a manager in a hotel. His mother,Mrs Brown, is an English teachers at his school. Nick has a sister. Her name is Kate. Now they study in the same school.Look!This is a picture of their school. It is very big. There is a tall building with 23 classrooms in the middle of the school.The library is behind the tall building. The sports hall is next to the library. A playground is in front of the sports hall. It's big too. Nick and Kate like their school in Beijing very much.

点P（﹣2，1）在平面直角坐标系中所在的象限是(     )

下列粒子结构示意图中，表示阳离子的是（　　）

1. What was his ____ (反应) to your answer?

2. We have bought lots of ____ (设备) for our new lab.

3. The lock has ____ (生锈) and needs oil.

4. I came to the ____ (结论) that he had been lying.

5. He kept his ____ (平衡) with his arms on top of the wall.

6. The ____(沸腾的) kettle was giving off steam.

7. As a result of pollution，there are many dead fish ____ (漂浮) on the water.