It was my sister first had the idea to cycle along the entire Mekong River from ______ it began to where it ends.
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.
29. I like Mr. Miner's speech; it was clear and______the point.