9. We can only get into the house if someone has a key.
10. Unless we try to reduce world population, it will continue to rise.
11. Unless you keep your feet dry, you will catch a cold.
12. Unless you leave now, we will miss our ride home.
13. Unless you rest, you will be ill.
14. Unless there is water, this tree won't grow.
15. Unless you watch the programme, you can't really guide.
16. Unless you go out in the rain, you won't get wet.
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