根据句意,选择方框中的短语并用其正确形式填空.
thousands of ,main idea ,pay for ,a fair price ,an hour ago
1.I had my supper ____.
2.____ young people took part in the party last night.
3.It's ____.I'll take it.
4.Can you find out the ____ of the passage?
5.My mother ____ one hundred yuan ____ my shoes.