摘要：2 We must do as much as we can to make our community better and more beautiful. 3 Since Kwanzaa is a time for learning as well as joy, people celebrate it by lighting a candle each day and discussing one of the seven principles of Kwanzaa. 4 Each time we celebrate a festival it changes a little and in that way we keep our culture alive. 5 It is a reminder that we need to care about the world we live in and that we should learn to respect life and nature. Unit 15 词组 1 ten years of hard work 2.a moment’s rest 3.after all 4.call on sb 5.work day and night 6.at the most 7.pay back the money 8.invite sb to an evening party 9.try on 10.without luck 11.have a good time 12.be worth five hundred 13.ask for permission 14.on the way 15.pay off debts e up with a very good story 17.have a hard time 18.on the other side of town 19.build up one’s self-confidence 20.dream of doing

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