1. What ______ pity that you couldn’t be there to receive ______ prize.

A. a; the       B. a; a       C. the; the      D. the; a

2. You may use the room as you like __________ you clean it up afterwards.

A. so far as      B. so long as    C. in case     D. even if

3. It _____ have been Tom that parked the car here, as he is the only one with a car.

A. may         B. can         C. must       D. should