UNLESS YOU KEEP YOUR FEET DRY, YOU WILL CATCH A COLD
18. Unless you keep your feet dry, you will catch a cold.A. You won’t catch a cold even if you don’t keep your feet dry.B. You will catch a cold if you don’t keep your feet dry.C. You will catch a cold if you keep your feet dry.D. Unless you keep your feet wet, you won’t catch a cold.