1. collect 2. recycle 3. plant 4. build 5. clean

Solution:

• 1. collect rubbish (a)
• 2. recycle cans (e)
• 3. plant flowers (d)
• 4. build nesting boxes (c)
• 5. clean out a pond (b)

Final Answer: 1-a, 2-e, 3-d, 4-c, 5-b