回上一层第七部 第四课 --- 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
- in vain
- Sylvia tried in vain to catch the butterfly on the flower.
- As a consequence of not going to classes, I was studying for the exam in vain.
- inside out
- Wayne mistakenly wore his socks inside out, which made all the students laugh.
- just about
- Teresa was just about done with cooking when the children came home.
- just in case
- I have more than enough cash in my wallet, just in case.
