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**Giấy bài tập**

1. My back has been hurting for weeks.
2. You must _______ give you 5 more minutes.
3. You _______ have to respect your values.
4. You _______ have to finish your homework before you go to bed.
5. You _______ spend too much time talking to your friends.
6. You _______ have to spend too much time on social networks such as Facebook.
7. You _______ be tolerant if their children’s children behavior.
8. All students _______ wear uniforms.
9. This drink isn’t _______ for health.
10. This warning sign _______ indicates that you ought to not step on the grass.
11. You _______ do exercise in order to keep your body in good shape.
12. You _______ submit it to me at 10:30.
13. You _______ be rude to them.
14. Both B and C.

**Chú ý:** Các từ được gạch chân là: beneficial, indicates, therefore, mustn't, should, shouldn't.