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Everyday I thought about postcards.
think of 想到
eg. What do you think of?
What do you think of the weather day?
think over 仔细考虑，反复思考
eg. I should think over it.
think out 想出来
eg. I cann't think out this question.
I spent the whole day in my room, but I did not write a single card!
spend 花(时间），度过
人+spend+时间+地点 在什么地方花费 / 度过了多少时间
eg. I spend ten hours in the school everyday.
spend 花费（金钱）
人+spend+金钱+on sth. / （in） doing sth.
eg. I can’t spend any more on this car.
