Here are the corrections and indications of which sentences are true:

1. Play less computer games.
- ü

2. Do more morning exercise.
- ü

3. Spend more time with your family.
- ü

4. Work on less computer.
- Corrected: Work on the computer less.

5. Read more books and watch fewer films.
- ü

6. Eat more meat and eat more vegetable.
- Corrected: Eat more meat and eat more vegetables.

7. Do fewer outdoor activities.
- Corrected: Do more outdoor activities.

8. Earn more money and spend fewer on unnecessary things.
- Corrected: Earn more money and spend less on unnecessary things.

9. Have fewer coke.
- Corrected: Have less coke.

10. Wash clothes with your hands more.
- ü

Feel free to let me know if you need further assistance!