27 He money to Greenpeace for a long time. (donate) 28 The government to reduce pollution for years. (try) 29 I to clean out ponds for a year now! (volunteer)

Решение:

• 27. He has been donating money to Greenpeace for a long time.
• 28. The government has been trying to reduce pollution for years.
• 29. I have been volunteering to clean out ponds for a year now!

Ответ:

• 27. has been donating
• 28. has been trying
• 29. have been volunteering