5.　　　 With so much work on hand, you _____ have gone to see the game last night.　　

4.　　　 One _____be punished for what one hasn't done.　　

3.　　　 I didn't see her in the meeting room this morning. She _____ have spoken at the meeting.　

2.　　　 ---"That must be a mistake."

---"No it ___ be a mistake."

1.　　　 You ___ hand it in at once, you may hand it in tomorrow.

17. ought to / have　 18. can/ could; can’t　 19. shall　 20. won’t

Unit 2

Fill in the blanks with proper modal verbs.

15. Must; needn’t; may/can　　 16. can’t

13. shouldn’t 14. Can/ May/ Could; can’t / mustn’t　　

8. couldn’t　 9. shall　　 10. can　 11. Could/ Would　 12. may　

1. Would　 2. should　　 3. must　　 4.would　　 5. can’t　　 6. will　　 7. Must