单词：push-pull sawtooth wave form
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A magazine quiz What does be polite mean? This means we should be nice to other people. When we are nice to other people, they are usually nice to us, too. People like to work with, play with and talk to polite people. Are you polite? Let's find out
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Joel: So, Mitchell, I only surfed for about a year and I never got very good at it. I wonder if you could explain how a beginner goes about learning how to surf. Mitchell: Well, that's a tough question because I was surfing ever since I was small so
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At DNC, Undocumented Aliens Push for More Immigration Reform For most of her life in the United States, undocumented immigrant Ireri Unzueta-Carrasco has lived in the shadows. There are a lot of obstacles when you are undocumented and you are trying
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