Modals1. - I got D in English literature because I didnt

Modals
1. - I got D in English literature because I didnt read The White Fang.
- I could have helped/must have helped you if you asked me to.
2. You neednt have watered/shouldnt have watered the flowers . Ive already done it.
3. - I did so badly in my writing test! Well, you should have studied/might have studied harder then!
4. Linda should be here by now. I dont understand why shes not here yet! She might have missed/must have missed her bus. Its not like her to be late.
5. Kate, could/may you go out to the blackboard?
6. You may be/maybe right, but let me have a look at your project first.
7. You shouldnt/mustnt smoke in the library. Its prohibited.
8. I didnt have enough money to pay the bus fee, so I had to/must walk home.
9. If you want to lose some weight, you should/must eat more vegetables.