回上一层第一部 第二课 --- 请重复跟读，直到可以於声音档的留空之间唸完整句為止；熟练之后您必将可以 "脱口而出" 地说出标準的美式英语
- all at once
- The earthquake, rain, and the car accident happened all at once.
- All at once the horse stopped, and the rider fell off.
- all but
- Jessica all but fell asleep while driving.
- all day long
- Jennifer had been working on the problem all day long.
- You will get bored at anything if you do it all day long.
- all in
- I was all in that evening when I got home after the birthday party.
