Is your schoolbag too heavy?The e-schoolbag will help you.It

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 (18) _____ .A schoolbag is (19) _____ lighter than a usual schoolbag.Perhaps the e-schoolbag should be (20) _____ an e-textbook.It is a small computer for students.It is as (21) ______as a usual book,(22) _____ it can still have all the things for study,such as textbooks,exercise-books and so on.They can made (23)____ chips(芯片）like stamps.The students can read the text page by page on the screen,take notes,or even send e-mails to their teachers.They only need to (24) _____ the right chip into the e-schoolbags .
Some people say (25) ______ e-textbooks can be easily broken,while others say they are good students' eyes.Perhaps only time will tell who is right.
( ) 16.A.use B.useful C.used D.to use
( ) 17.A.idea B.problem C.question D.nothing
( ) 18.A.work it out B.work out it C.work out D.work
( ) 19.A.very B.much C.too much D.much too
( ) 20.A.call B.calls C.called D.calling
( ) 21.A.small B.smaller C.smallest D.very small
( ) 22.A.and B.but C.or D.so
( ) 23.A.into B.from C.up D.through
( ) 24.A.bring B.take C.put D.carry
( ) 25.A.if B.what C.that D.whether

16---20ABABC
21---25ABACC