Exercise 1. Put “ can, may, must, should, ought to, have to, be to, be able to” (or the negative forms) and “ needn’t” in the spaces.

12. They ____ do all the exercises; it will be sufficient if they do four of them. 13. You ____ do whatever you like.

14. Sooner or later one ____ choose. 15. I ____ read to the end of the story, because I want to see who gets the treasure. 16. Go right in. You ____ report at once. 17. She ____ sing quite well. 18. You ____ say anything. Just nod your head and he will understand. 19. ____ I use your phone? – You ____ ask for permission; you ____ use it whenever you like. 20. Is she waiting? She ____ wait for me at home. We’ve arranged so. 21. You ____ take a horse to water, but you ____ make him drink.

22. The ice is quite thick. We ____ walk on it. 23. If you don’t know the meaning of a word, you ____ use a dictionary. 24. The day we ____ start, it rained worse than ever.