Here are the completed sentences with the appropriate forms of the words:

17. Eating more fruit will help us study **better** and feel healthier.

18. Mike couldn’t sleep last night. Today he was really tired, so he fell **asleep** in math class.

19. Tom wants to get good grades, so he makes an **effective** study plan.

20. Louisa never does any exercise. She’s **unfit** and feels tired all the time.