P-1:pack away 收藏起来 A:Where did you put that book? A:那本书你放哪儿了？ B:It was not my book. I have returned it. B：那不是我的书，我已经还掉了。 A:From whom did you borrow that book? A:你从谁那里借的？...

O-12:overdrive 过度操劳 A:Once out of the stress after finals, my energy level will go into overdrive. A：期终考试的压力一旦解除后，我的精力水平将进入过度玩乐。 B:Then you can enjoy yourself for some days. B：...

O-11:out of the question 不可能的 A:Could I hand in my paper a few days later? A:我的论文能晚几天交吗？ B:Im afraid thats out of the question. B:恐怕不行。 A:You mean the paper must be handed in in no time? A:你是说那现...

O-10:on-the-go(busy,occupled)经常不在家 A:You see, my brother is on-the-go all the time. A:你看，我弟弟整天不在家。 B:Why dont you stop him? B：为什么你们不阻止他呢？ A:My parents couldnt control him. A：我父母...

O-9:on the tip of ones tongue 就在嘴边 A:Interesting lectures, arent they? A:演讲很有意思，是吧？ B:Yes, very. I thought the last speaker was especially good. B:是的，非常有意思。我觉得最后一个演讲者尤为出色...

O-7:on the level 诚实无欺 A:I tried to return your novel this afternoon. But there is nobody at home. A：我今天下午去你那儿还书，但你家没人。 B:Why didnt you leave it next door? B：你为什么不把它放在隔壁呢？...

O-7:on the level 诚实无欺 A:I tried to return your novel this afternoon. But there is nobody at home. A：我今天下午去你那儿还书，但你家没人。 B:Why didnt you leave it next door? B：你为什么不把它放在隔壁呢？...

O-6:on the ball 精明的 A:If you keep your eye on the ball, you will surely succeed. A:如果你专心，你一定会取得成功。 B:But I am unconfindent of myself. B：但我不够自信。 A:If you aim at doing something,just keep it...

O-5:on tenterhooks 焦虑不安 A:You look so pale, Jean, Whats the matter? A:简，你脸色看起来根不好，怎么了？ B:I didnt sleep well yesterday night. B:我昨晚没睡好。 A:Something wrong? Can you tell me? A:出什么事了...

O-4:on earth 到底 A:Why did you stand there without a word? A:你怎么站那儿一句话也没有？ B:I didnt know what on earth to answer. B：我不知到底该说些什么。 A:Then, why did you say sorry to the teacher? A:那你怎么...