重点讲解：
1. was/were supposed to do sth. 本应该做某事；
例句：Wells
was supposed to put up half the money, but later backed out.
韦尔斯本应当出一半的钱，但后来他食言了。
2. take off 动身；出发；
例句：Let's
take off in an hour.
我们一小时后出发。
3. rip off 敲…的竹杠；对…漫天要价；坑骗；
例句：The airlines have been accused of
ripping off customers.
这家航空公司遭到向顾客漫天要价的指责。
4. take advantage of 利用；占…的便宜；
例句：I
took advantage of his weakness.
我利用了他的弱点。
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