Educators know that teaching students to write well is not easy. One problem is the amount of time needed to【C1】______large【C2】______of work. So some companies have developed computer programs. These can【C3】______student writing much more quickly than a human can. Writing tests can also cost【C4】______to【C5】______by computer than by paper-and-pencil. These computer systems are known as e-raters. They use artificial intelligence to think in a way【C6】______teachers. In the state of Indiana, computer grading of a statewide【C7】______test began with a【C8】______of the system itself. For two years, both a computer and humans graded the student writing. Officials say there was almost no difference between the computer grades and【C9】______given by the【C10】______readers. Systems are also being used to grade writing in college classes. The computers【C11】______a few hundred【C12】______of student writing already graded by humans. Then the systems【C13】______new essays【C14】______those already examined. How do teachers feel about all this? Many say machines can【C15】______the job【C16】______people can. A computer can find spelling and grammar mistakes.【C17】______these teachers say it can never really【C18】______what a writer is trying to say.【C19】______say a program cannot follow a thought or judge a humor【C20】______understand a beautifully expressed idea. 【C1】