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—Yes. I ________ lots of time on it. It's a good way to kill time.
—Every Tuesday and Thursday.
—Sorry, let's make it ________ time.
—It's very interesting.
—Yes, I do. And you can see that books are made _______ paper.
—Not quite sure. Maybe 30 yuan.
—Sure. No subject can be learned well ________ hard work.
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