----------the robot is very useful to us,we should treat it correctly

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• ----------the robot is very useful to us,we should treat it correctly
• 同意句转换 i went to shanghai by plane and began to like it . i __to shanghai and __ __ __ __it.i will go to usa in the future . i will go to usa __ ____ ____.he asked us when we should leave .he asked us __ ____ ___ .i didn't pass the testi ___ in____ the test i found it very useful to learn english well.i found it _____ useful to learn english well.
• （－2分之一）的2007次方＋（－2分之一）的2008次方
• English ie very useful,so we should be ( ) in it and learn it well.