Using the correct form of (eat, ate, sit, set)

Question

1.Someone (eat) all the leftover sandwiches.
2.Thank you, but I have already (ate, eaten) lunch.
3.After splitting the logs, the farmer (sat, set) his ax on the ground.

1.ate
2.eaten
3.set

Answer 1

Great! They are all right.

Answer 2

Thanks. Have a good night.

Answer 3

You're welcome. You have a good night, too.