26 If you want to succeed in life, you should/need to work hard, and always keep to your goals. 27 Jane has a talent in writing. She needs to/ should take part in the short story competition at school this month. 28 If your roommates are too noisy, you ough to/need to study at the student library. It quiet there. 29 George should have/must have studied a lot f the history exam. He got very high marks. 30 Students mustn't/needn't run in the sch corridors. It's against the rules.