回上一层第二部 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
- become of
- What will become of the children if their parents die?
- What will become of us if the meteor really hits the earth?
- believe in
- I believe in Joseph's ability to drive safely.
- better off
- Am I better off living in a single room or a double?
- beyond any doubt
- She is right, beyond any doubt.
