句型转换。

1. He ran in the school for half an hour (对画线部分提问)

    _______ _______ _______ he run in the school ?

2. We started to skate two hours ago. (对画线部分提问)

    _______ _______ you start to skate?

3. They started to play the piano one or two hours ago. (改为同义句)

    They started to play the piano_______ _______ _______two ago.

4. They have been away from here since two years ago. (改为同义句 )

    ______ ______two years______ they left here.

5. The man began to work four hours  ago. (改为同义句 )

    The man has _______ _______ four hours.

境内外币支付系统参与者借方清算净额之和与贷方清算净额之和相等（以下简称试算平衡）的，外币清算处理中心应如何处理?