回上一层第二部 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
- at random
- Children's books were piled at random.
- at times
- At times, Jessie's mother lets her take care of the baby.
- He went to the badminton club on weekends, at times.
- attend to
- I have other important matters to attend to.
- Kelly didn't attend to what I was saying.
- back away
- The SWAT captain ordered the teammates to back away from the door.
