Choose the correct options

1. Wear sunscreen
   [if | unless] it's sunny outside.
2. We will go sailing
   [if | unless] the wind is too strong.
3. You will get wet immediately
   [if | unless] you wear some waterproof clothes.
4. I would let you drive the car
   [if|unless] you weren't so irresponsible.
5. I would help you
   [if | unless] I could.
6. [If | Unless] you were quiet, I could concentrate on my reading.
7. He could be a better runner
   [if | unless] he trained harder.
8. I won't give John's personal number to anybody
   [if |unless] it is an emergency.