Heavy schoolbags are causing back problems.It sure is.But we can't decide what to do/how to do it答案是what to do,但是第二个为什么不对,希望给出具体清楚的解释,

Is your schoolbag too heavy?The e-schoolbag will help you.It is said that e-schoolbags are going to be brought into (16) ______in Chinese middle schools soon.Heavy schoolbags have been a serious (17) _____ for a long time,but the e-schoolbags will (1 where are the twins'schoolbags什么意思 Some are smaller than our schoolbags是什么意思 where are their schoolbags?()are in the classroom 填什么 Heavy schoolbags are causing back problems.It sure is.But we can't decide what to do/how to do it答案是what to do,但是第二个为什么不对,希望给出具体清楚的解释, heavy schoolbags have long been a serious problem for them这句话中的long 是什么用法 (---)are these schoolbags?They're green ,yellow ,blueand red. There are some good books in our schoolbags同义句_ _ some good books in our schoolbags 我是接刚刚那个问题的分不多了高手速来Is your schoolbag too heavy The e-schoolbag will help you .It is said that e-schoolbags are going to be brought into ( 1 )in Chinese middle school soon.Heavy schoolbag have been a serious ( 2 ) fo These bags are heavy. Pandas are usually heavy E-schoolbags.Is your schoolbag too heavy The e-schoolbag will help you .It is said that e-scho （ ）schoolbags are these?They are Tom's and Mary's. 请翻一下Some,Dinosaur,Are,bigger,Than,house,Some,Are,Smaller,than,our,schoolbags 英语一篇短小阅读.急要~Is your schoolbag too heavy to carry?The e-schoolbag will help you.It is said that e-schoolbags are going to be brought into use in Chinese middle schools soon.In fact,the e-schoolbag should perhaps be called an e-text Those are schoolbags.(改为一般疑问句,并作肯定和否定回答) What will the clerk do when the big brown schoolbags are in the store是什么意思 are;heavy;how;you联词成句