1. We were told to clean a thick layer of dust on the furniture. 2. All the people who joining in the meeting supported to make the best of the time in developing the west . 3.The new leader is keen on the abolition of the old rules . 4.If you made up , you are likely to be recognized as a pop singer. 5.In the eyes of some employers, part-time job means betrayal. 6.Ironically, in the past, those who work hard are so heavy exploitation that sometimes they face a risk of being starved to death. In the black American opinion, race is a sensitive topic. Since africans were shipped to the United States, racial discrimination has been deeply rooted social problem in the United States. Heavy exploitation and rough treatment finally forced them to seek liberation. "Underground railroad" is a to deliver plantation slaves as much as possible to the terminal - the state of freedom for the historic mission. "Conductor", that is, those who support the abolition of slavery, will use a variety of conditions as much as possible. Usually they risk was caught by slave owners, let the slave makeup under the road ahead.