Complete the sentences with the right forms of verbs using the 0 and 1st Conditionals

1. When it rains, we
   [ ]
   our things and go back to the car.
2. If I have enough time today, I
   [ ]
   my friend.
3. If I
   [ ]
   the kettle on, the water in it boils.
4. Unless I
   [ ]
   on time, I become irritated.