Underline should or shouldn't.

Ответ:

1. 17. I think I am getting a cold. I should take some vitamin C tablets.
2. 18. She shouldn't go to the doctor. She doesn't look well.
3. 19. Paula shouldn't worry. She always does well at Maths.
4. 20. If you are tired, you shouldn't go to bed early tonight.
5. 21. We shouldn't fight. We are best friends!