70. letter of recommendation 推薦信;letter of reference 推薦信

　　71. look on the bright sides of things 看事物的光明面

　　72. no kidding 不是開玩笑吧

　　73. on the tip of one's tongue 就在舌尖

　　A: Are you sure you can’t remember the name of that record?

　　B: It’s just on the tip of my tongue!

　　74. quitting time 下課時間

　　I’m glad it’s almost quitting time.

　　75. take it over 重修

　　Don failed physics and had to take it over.

　　76. than necessary 比應該的要冷

　　The lab was cooler than necessary.

　　77. That’s easer said than done. 說來容易做來難

　　78. There is nothing to it. 沒什么，很容易

　　I can run this projector. There’s really nothing to it.

　　79. with flying colors 成功

　　A: How did Ellen do on her American History exam?

　　B: She passed with flying colors.

　　80. You can bet your life 當然

　　A: Will Prof. Smith come to class on time?

　　B: You can bet your life.