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【題目】When were the first modern traffic lights invented？

【題目】Where does the conversation take place？

【題目】Who did Eric go to library with？

【題目】—My mother has gone to Xiamen.

【題目】Erquan Yingyue is one of the most moving pieces of music ________ I have ever heard.

【題目】Robots ________more heavy work for us in the future.

【題目】—Remember to print on both sides of the paper.

【題目】—Where’s Judy? She hasn’t been in school for two days.

【題目】— I’m having some ________finishing the work by myself. Can you help me?

【題目】—What’s the low-carbon (低碳的) lifestyle like?