What is wrong about improving our listening?

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• Having a big smile while chatting is a good suggestion for improving your social skills.
• （）.English grammar is helpful for improving English listening.
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• 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。
• We are focusing our attention on building a strong （）and improving the quality of our products.