E. Complete the sentences using the Present Perfect Continuous form of the verbs in brackets.

24. She has been studying the environment for over ten years.
25. We have been working hard to build nesting boxes.
26. It has been raining for two days.
27. He has been donating money to Greenpeace for a long time.
28. The government has been trying to reduce pollution for years.
29. They have been volunteering to clean out ponds for a year now.