Choose the correct answer for each question.

1. You __________ have posted my letters for me while you were in the post office.

   1.   ?    might
   2.   ?    didn't
   3.   ?    can
   4.   ?    mustn't

2. It __________ have been a good idea to asked her before you just jumped in.

   1.   ?    may
   2.   ?    could
   3.   ?    might
   4.   ?    should

3. I can't imagine what you __________ to do something so stupid.

   1.   ?    could have been thinking
   2.   ?    couldn't have thought
   3.   ?    cab have thought
   4.   ?    mightn't have been thinking

4. I __________ say this much for him: he's very generous.

   1.   ?    will
   2.   ?    could
   3.   ?    may
   4.   ?    might

5. He __________ , though I warned him not to.

   1.   ?    would go
   2.   ?    can have gone
   3.   ?    must go
   4.   ?    would have gone

6. He __________ it; he was with me all the time.

   1.   ?    won't do
   2.   ?    can't have done
   3.   ?    can't do
   4.   ?    mightn't have done

7. You __________ told them that! I asked you to keep quiet!

   1.   ?    shouldn't have
   2.   ?    wouldn't
   3.   ?    mightn't have
   4.   ?    mustn't have

8. Well, you __________ have sold him the car if you didn't think he would pay you.

   1.   ?    needn't
   2.   ?    may not
   3.   ?    mustn't
   4.   ?    can't

9. You __________ have helped me a little more - you weren't doing much.

   1.   ?    may
   2.   ?    could
   3.   ?    can
   4.   ?    must

10. __________ you have left the keys in the car?

    1.   ?    Needn't
    2.   ?    Must
    3.   ?    Could
    4.   ?    May