用下列句式造句 主语+spend+some time/some money 【in】 doing sth 主语+spend+sometime/some on sth

i spent two hours working out this problem.
i spent two hours on this problem.
it took me two hours to work out this problem.
i spent 10 yuan on this book.
i paid 10 yuan for this book.
this book cost me 10 yuan.

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