Choose the correct forms to complete the sentences

1. If I eat less fat and sweets, I
   [become|will become] more fit and energetic.
2. We will invite guests if our parents
   [finish|will finish] their work early.
3. When I'm too tired to cook dinner, I
   [will order|order] take-out.
4. If we
   [don't complete|won't complete] this project on time, the teacher will be furious.
5. When I drink too much coffee, I always
   [get|will get] a headache.