Find the mistake in the four underlined parts of each sentence and correct it. 11. You mustn’t cheat in exams because the teacher will punish you when you do that. 12. I’m so worried because I mustn’t be at home after school right now. 13. It is more interesting book I have ever read. 14. What’s the better film you have ever seen? 15. You mustn’t look after the house when your parents are away 16. It is raining heavily outside. You shouldn't bring your raincoat. 17. She always give presents to her parents on Tet holiday. 18. She will helps her mother decorate the house before Tet. 19. I don't think that lucky money can bring us good and bad luck. 20. The New Year Festival in Thailand is on April. It is very hot.