don't make promises all the time,you should know _____ speak louder than word 填空

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• 短文填空,填出单词.it is everyone‘s dream to be a good student.but,do you know【】to make it happen?I have two pieces of【】.【】,make full use of your【】and work hard.don’t put off till【】what you should do today,because time will【】come back.second,give yourself enough time to【】it‘s important for us to do some sports for exercise.Exercise 【】make our body【】and stong and study better.To be a good student is easier said than done.But【】is difficult for us if we put our h
• don't make promises all the time,you should know _____ speak louder than word 填空
• 将硫酸铜与硫酸中放入铁粉,完全反应后固体质量与加入铁粉相同,求硫酸铜与硫酸的质量比将硫酸铜与硫酸混合溶液中加入铁粉,完全反应后,固体质量与加入铁粉质量相同,求原混合溶液中硫酸铜与硫酸的质量比是多少我知道结果,要的只是具体过程!
• a克铁粉与含有硫酸的硫酸铜溶液完全反应后，得到a克铜，则参加反应的硫酸铜与硫酸的物质的量之比是（　　）A. 1:7B. 7:1C. 7:8D. 8:7