用适当的关系代词或关系副词完成下列句子。

1. I hope to visit a place_____ the weather is cool.

2. The village in_____ my grandparents used to live lies at the foot of a mountain.

3. I know a place_____we can have a wonderful time.

4. The girl_____ is standing there is my sister.

5. Do you like the shirt_____ is very expensive?

关于安全用电常识，下列说法中正确的是（　　）

A．发现有人触电时，立即用手将其拉离电源

B．用湿抹布擦拭亮着的电灯泡

C．安全照明电路必须把电灯的开关接在火线上

D．保险丝熔断后，可用铜丝或铁丝代替