Первый столбик:
1.i must eat
2.i must go toschool
3.I must do my homework
4.i must be careful on the road
второй столбик.
1I should go for a walk
2.i should eat properly
3.i should be friendly with people
4.I should breden my mind
третий столбик.
1.I needn't do my last homework
2.i needn't do my housework,that i've already done
3.i needn't go where i was last week
4.i needn't do somebodys' work