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5. Choose the correct alternatives in the following sentences. Either one, two or all three alternatives may be possible.
1. I made a cake specially for tonight, but I mustn't/needn't/shouldn't have bothered.
2. I thought at first they might/will/could not accept me because of my lack of qualifications but I needn't/couldn't/shouldn't have worried.
3. They think he must/ could/should have left the country.
4. You might/ought to/should at least help me! 5. I really needed to study/must have studied/ought to have studied hard for the exam but the only thing I did was to sleep.
6. You must/should/can be joking.
7. You mustn't/can't/shouldn't open this parcel before Christmas.
8. You needn't/don't have to/can't work tomorrow if you don't want to.
9. In my job I have to/must/should travel a lot.
10. I can't find my keys. I must have/should have/might have left them at home.​