Correct the following sentences:
1. Asia is more big than Europe.
2. Vegetables are a healthy choice than candy.
3. Fresh food has more vitamins and minerals as fast food.
4. Fresh food is more good for you than fast food
5. People will live on Mars someday and it is too expensive to travel there now.
6. Mars is too cold for human visitors but they will need to warm it up.
7. The school ought turn off the light at night. 8. We could saving energy if we unplug our computers at night.