12. Fill in: if, when, unless.

1. Unless you finish your homework, you can't go to the party.
2. If you don't run, you will miss the bus.
3. When you are ready to leave, call me.
4. If it stops raining, we won't go for a walk.
5. If you eat your dinner, you can have some cake.
6. If he comes soon, we will have to leave without him.
7. When you finish the report, give it to the manager.
8. If you like this soup, you can have some more.
9. When you leave the house, lock the door.
10. Unless we save some money, we can't go on holiday this year.