重点讲解：
1. run out of
用完；耗尽；
eg. They have run out of ideas.
他们已经想不出任何办法了。
eg. We're running out of time.
我们快没有时间了。
eg. By now the plane was running out of fuel.
现在，这架飞机的燃料快用完了。
2. set upon
突然攻击；袭击；
eg. We were set upon by about twelve youths and I was kicked unconscious.
我们遭到了大约 12 名青年的袭击，我被踢晕过去了。
eg. Life is becoming a greater adventure and the only limits are those that you set upon yourselves.
生活正在变得更具有冒险意义，而仅有的限制是那些你自己强加于自己的。
3. be supposed to do
（按计划或期望）应当，应该做某事；本应该做某事；
eg. He produced a handwritten list of nine men he was supposed to kill.
他拿出了一份手写的名单，上面列有9个他应该要杀死的人。
eg. The first debate was supposed to have been held on Tuesday.
第一场辩论本该在星期二就举行了。
4. How can you tell
你怎么知道？
eg. These kittens look exactly alike how can you tell which is which?
这些小猫看上去一模一样--你怎么能分出哪个是哪个?
eg. How can you tell which button to press?
你怎么能判断出该按哪一个按钮?
5. pitch dark
漆黑的；乌黑的；
eg. It was pitch-dark in the room and I couldn't see a thing.
房间里一片漆黑，我什么也看不见。
eg. It was pitch dark in the corridor and I had to feel my way along.
走廊里漆黑一团，我只得摸索着走过去。
