A Paper-less Classroom
A paper-less classroom is what more and more schools are trying to achieve. Students don't do any handwriting in this kind of class. Instead, they use a ____1____(special) designed computer. The teacher downloads texts from internet libraries and sends them to every students'___2____(person) computer.
___3___( have) computer also means that students can search the web. It is very___4___ (effect) for their study. They can look up information on all ___5___(subject) they studying, from math to social science. And exams can also go online. At school in U.S., students take tests on their own computers. The teacher records the grades on the network for everyone to see and then ___6___ (copy) them into his or her own electronic grade book.
A paper-less classroom is a big step towards ___7____(reduce) the waste of paper. A teacher said that she used to give about 900 pieces of paper each week to the students and this paperless way of learning is ___8____ (friend) to the environment. But with all this technology, there is always the risk that the machine will break down. So, in case of a power ____9___ (fail) or technical problem, paper textbooks are still ____10___ (wide) used for those students.
5、____.
【正确答案】：subjects
【题目解析】：subject是可数名词，all需要加可数名词复数，所以答案是subjects。
