Choose the correct option to complete the sentences:

1. I) I am familiar ______ that song.
   

2. II) Were you aware ________ the regulations against smoking in this area?
   

3. III) What John said is contrary _____ common sense.
   

4. IV) This winter, Paul will be eligible _______ a three-week vacation.
   

5. V) How do you account _____ this discrepancy?