补全对话,每空一词.a:What is that It looks strange.b:It's ____ old ma

补全对话,每空一词.
a:What is that It looks strange.
b:It's ____ old machine.
a:What was it used for?
b:It was used by people for ___ water ___ a river or a lake.
a:How ____ it work?
b:Usually two people stood ____ it.They pushed the pedals down hard with their ____.
Then ____ could be brought up.
a:What was it made ___?
b:It was made of ____ .It can be hardly seen in China now.
(这倒底是个什么东东啊?)
(这倒底是个什么东东啊?)