Keep silent or you'll wake the baby up

----- Nội dung ảnh -----
1. Keep silent or you'll wake the baby up
->If............................................................

2. I don't know the answer, so I can't tell you
->If............................................................

3. If you are not careful, you will cut yourself with that knife
->Unless.........................................................

4. If you do not like this one, I'll bring you another
->unless.........................................................