答案：【解析】：
这是一道英语阅读理解填空题，考查对文章内容的理解和提取关键信息的能力。解题的关键在于仔细阅读文章，找到与题目中各个填空相关的描述内容。
1. 对于（1），文章明确提到“Upcycling is all about taking old things and giving them a new life by adding value.”，所以此处应填“old things”。
2. 对于（2），文中提到“It is a simple way to reduce waste and save energy.”，所以这里填“reduce waste”。
3. 对于（3），根据“You probably have some old pairs of jeans somewhere in your house. Most of the time, you just throw old jeans away. Instead, why not turn those old jeans into a stylish bag?”可知，此处填“stylish bag”。
4. 对于（4），由“How about making a cool new bookshelf out of an old ladder? Or out of old bricks and boards?”可得，这里填“bookshelf”。
5. 对于（5），从“Challenge yourselves today, readers! Look around your homes for something old or forgotten.”可知，应填“homes”。
6. 对于（6），依据“When you finish your upcycling project, share your creation on our website.”可知，此处填“share”。
【答案】：
(1) old things
(2) reduce waste
(3) stylish bag
(4) bookshelf
(5) homes
(6) share