1. (2021高二上·哈尔滨期末) 阅读下面材料，在空白处填入适当的内容（不多于三个单词）或括号内单词的正确形式。

Saving the Earth

One day, I  (go) with the group to a nearby river. We wanted to check it was clean. We did many scientific tests to see if the river was  (health).

Surprisingly, it was! We still, though, took any rubbish  we could find out of the river. We wanted to make sure fish could live there  (happy).

Recently, I helped the group plant  (flower) at our school. We're hoping the flowers will bloom (开花) this spring and make the school  (look) beautiful. How did we pay for all the plants? We made T-shirts and sold  to our friends! We've still got some money left from  (sell) the T-shirts. We hope to use it to buy some recycling bins (回收箱) the school.