Rewrite the following sentences without changing the meaning

2. The Browns last painted the living-room two years ago. → The Browns have ________________________________.

3. Why don't we join them on the trip to the mountain? → I suggest _______________________________________. 

4. We must be grateful to all the teachers. They have helped us a lot in our lives. → We ______________________________________________.

5. He actively participated in the fight against air pollution. → He _____________________________________________