1. B
依据：第一段中But some people think they buy too much.
2. C
依据：第二段中The idea for Buy Nothing Day started in Vancouver, British Columbia.
3. D
依据：第四段中Next year, they want to have another dinner to inform more people about Buy Nothing Day!
4. A
依据：第二段中Now people all over the United States celebrate Buy Nothing Day.
5. A
依据：总结全文可知。
答案是bcddd
BCCAA
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