1. We __________ for her because she never came.
A. needn’t wait B. shouldn’t have waited
C. mustn’t wait D. mustn’t have waited
2. Where is my pen? I __________ it.
A. might lose B. would have lost
C. should have lost D. must have lost
3. Janny __________ have kept her word. I wonder why she changed her mind.
A. must B. should
C. need D. would
4. We __________ last night, but we went to the concert instead.
A. must have studied B. might study
C. should have studied D. would study