想要爬上高高的树顶，先要把单词补全。请根据线索，摘取相应树叶上的字母进行组合，来补全单词，登顶大树吧！

1. There are four of these each year， and spring is one of them.

2. A part of the tree; Green in summer and yellow in autumn.

3. A part of a plant; beautiful and colorful.

4. Insect（昆蟲） with beautiful colored wings.

5. Put these in the ground to make plants grow.

6. Water falling from the sky.

7. Not too hot; not too cold.