Ответ:

1. had left

2. have made a

3. had already started

4. has finally stopped

5. i`ve just had a lunch

6. hadn`t cleaned it

7. had made up

8. i`ve had

9. had noticed

1) People had left litter everywhere.

2) You have made a mistake.

3) The film had already started.

4) It has finally stopped.

5) I just have had lunch

6) He obviously hadn’t cleaned it for weeks.

7) They have made up their mind

8) I have had really tough week

9) have noticed.