________ the police thought he was the most likely one,since they had no exact proof about it,they could not arrest him.
34. ---I heard you almost missed the train.---Yes. I got to the railway station with only five minutes to_______.
33. Being able to speak another language fluently is a great_______when you're looking for a job.
32. Alice’s father always brings her a nice gift_______he returns home from his business trip.
31. All his attention______on the computer game, so he even didn't notice his mother enter the room.
30. The No. 5 subway line, ______in October, 2007, has greatly improved the traffic conditions in Beijing.