Составить предложение в Present perfect continuous с for или since

1. Some governments have been trying to protect the environment for twenty years.

2. Have you been working at the TV studios since May?

3. Bill has been thinking about getting a new car for months.

4. Lesley has not been living in Meg's flat since last Christmas.

5. You have been eating too much since our holiday in March.

6. We have been looking forward to seeing you for weeks.

7. What have you been doing since last summer?

8. I have not been learning Spanish for very long.

9. Thomas has been writing his History essay since Saturday morning.

10. Have you been waiting for me for hours?