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?