题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Double 11, originating from some universities in Nanjing in 1. 1990s, is called Singles Day in China because it falls 2.. Nov.11 by coincidence（巧合）when many young people will hold many parties to look for the one they love.

But in 2009 the online retail firm（零售公司）Alibaba adopted the day to promote a massive online shopping sale. It is said that the date was easy 3.(remember), and conveniently placed in a consumer spending lull（淡季）between National Day 4.Chinese New Year holiday.

Since 2011，Double 11 5.(become) the symbol of E-commerce, when people can buy lots of things they like at a low price. However, there are also some 6.(disadvantage). For example, people might buy some products they don't need at all or buy something with a high price but in low quality. What's 7.(bad), there are always lots of complaints and they may therefore get annoyed for this. In my opinion,8. shopping online on that day brings consumers a lot of convenience, they should be 9.(care) and buy in the shop with a good reputation in case of 10.(cheat).