根据对话内容，从方框内选择合适的句子补全对话。（有两项多余）

A: You don't look very happy, Betty. What happened?

B: (1)_________

A: When did you buy it?

B: Just half a year ago.

A: It must be very cheap, right?

B: No. (2)_________

A: Why did you buy this one?

B: (3)_________ The words in the ad sounded good, so I decided to buy one.

A: (4)_________ Some are misleading. They just lead you to buy the products, but they don't tell you anything about the quality of them.

B: You are right. We can't believe them all the time. (5)_________

A: Sure. You should compare more products and choose the best one.

请仔细阅读下列材料回答问题：

材料一：

材料二：五四运动是中国近代史上具有划时代意义的事件。五四运动发生在俄国十月社会主义革命之后，极大地推动了马克思主义在中国的传播。五四运动是彻底的不妥协的反帝反封建的爱国运动，它标志着中国新民主主义革命的开始。

（1）材料一是五四运动中的一个画面。请写出五四运动前期和后期的两个中心城市。

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（2）材料二“新民主主义革命的开始”指的是哪一年？

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（3）五四运动孕育了爱国、进步、民主、科学的伟大精神。谈谈你对五四精神的理解。

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