I wonder pet fish 应该填why do people keep fish还是why people keep fish,他们两句话的区别 .

I wonder pet fish 应该填why do people keep fish还是why people keep fish,他们两句话的区别 .
I wonder pet fish 应该填why do people keep fish还是why people keep fish,他们两句话的区别 .

I wonder pet fish 应该填why do people keep fish还是why people keep fish,他们两句话的区别 .
第二个,陈述句语气.