题目内容：

阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出 提示词的空白处用括号内所给词的正确形式填空。

You have probably dreamed about 1. you would change the world, only to find that it seems impossible. However, you may have the power 2. (make) the world better with steps by steps. That’s the idea behind the BA Challenge, which is a public service campaign co-initiated by Alibaba and Sina Weibo. It asks people to do something positive and then record the changes before and after. Since its first 3. (appear) on Sina Weibo on Sept. 2nd, the BA Challenge has attracted millions of viewers and participants. 4. these little things may be easily ignored in our daily lives, they are well received by many viewers.