Complete each sentence so that it contains might, might not, must, mustnt, cant or can. More than one answer may be possible.
1. Were not sure but we _________ go to Prague for Christmas this year.
2. Bill cooked the lunch, so you _________ expect anything special!
3. You really ________ start spending more time on your work.
4. Thats really stupid idea! You _______-be serious, surely!
5. You ________ realize it, but this is very important to me.
6. Tell Mike he _________ take my book if he needs it.