Present Perfect and Past Simple

1. Have you washed the car?
2. You haven't eaten very much.
3. They've opened a new supermarket.
4. You've written it in pencil.
5. I've made the sandwiches.
6. We've had our lunch.
7. United have scored a goal.
8. The balloon has landed in a field.
9. Who's broken this glass?
10. It's warm because the heating has been on.
11. Have you sold your flat yet?
12. I've finished that job at last.