improving

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improving

1.Having a big smile while chatting is a good suggestion for improving your social skills.2.（）.English grammar is helpful for improving English listening.3.also increase material density, improving powder compressibility during tablet formation.4.Man, was, is and always will be trying to be improving his living conditions.译文：人类过去，现在和（）总是在尽力改善生活条件。5.What is wrong about improving our listening?6.We are focusing our attention on building a strong （）and improving the quality of our products.