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37 Unless you eat an apple a day, you won't stay healthy .
38. Unless you stop wasting, you will run out of money.
39. Don't call me if it isn't an emergency.
40. Jane will not pass the test if he doesn't study harder.
41.  Unless Jane finishes her work before 6 pm , she wil not dine out with her friends.
42. My brother won't go travelling this summer unless he finds a companion.
43. It is not easy to do these exercises if you don't listen attentively to the teacher.