12. You…………… cheat in a test.
13.We …………… do more exercise to stay fit.
14. You…………… turn the music too load : đợi .
15. There …………… be something wrong with the engine : động cơ of this car.
16.You…………… help in the house.
17. We …………… give up when we are so close.
18. You…………… annoy: làm phiền your little sister.
19. This was a nice evening. We……………meet again.
20. You……………bite nails : cắn móng tay.
giúp mk với.thanks
12. musn't
13. must
14. mustn't
15. must
16. must
17. mustn't
18. mustn't
19. must
20. mustn't