3 )Complete the letters with the correct verbs?

3 )Complete the letters with the correct verbs. Can't - had better - have - mustn't - ought - should Dear Marge My teacher says I (1). Study the subjects I want because my grades aren't very good. I know I (2). Spend longer on my homework but it's hard. I (3) . To help a lot at home. I've got a brother and he (4). To help too, but he doesn't. My mum says we (5). Talk about family problems to strangers. But I think I (6) . Tell my teachers. What do you think? Nancy.