Once Thomas Edison worked as a telegraph operator (电报员)．He worked at night, during the 1 he read books and made experiments．So he was very 2 ．Sometimes he slept at night．When the other operator sent a message, Edison didn't 3 ．He was asleep．They soon found a way to keep him 4 ．They told him to telegraph the letter A every hour．In order to do this, Edison 5 stay awake．Edison didn't like this at all, he was still tired．So he 6 a new instrument which sent the let-ter A every hour．It 7 failed, so the other operator 8 the letter every hour．They didn't realize that Edison was such a wonderful man．One night they looked 9 his room．He was sleeping deeply and this instrument was sending the 10 ．
On a white sand beach near the blue ocean,there lived a mother crab and a baby crab．One day the mother crab saw a beautiful crane(鹤) walking about in the 1 ,a straight lovely walk on its long legs．“How lovely that crane 2 ,”she said to herself．The mother crab was 3 from a distance．The small baby crab was walking sideways．So the mother crab said to the baby crab,“You shouldn't walk like that．You should look 4 and walk straight．”The baby crab made 5 his mind to walk straight．He tried, 6 failed．“Why don't you show me how to walk straight,Mother?”he asked her．“If you show me the straight way,I'm sure I will do it, 7 ．”So the mother tried to show her son how to do the straight walk,but no matter how 8 she tried,she could not．Her legs did not seem to be 9 to walking straight．“I give up,”she said,panting(气喘吁吁地) 10 several unsuccessful attempts(尝试)．“Forget it,child,I don't think it is possible for us to walk like the crane．Let's walk in our own way．”
Most adults once studied at the school,had classes and did their homework every day．The same 1 is going on at the school now． 2 it seems that doing weekend homework is 3 problem for modern students．
All the students should agree that weekend homework should be abolished(取消)．It's 4 for them studying at school five days a week．They have a lot of interests．With homework to do on Saturday and Sunday,when can they find 5 to help around the house,go and see a football or basketball game or a good film,join in family recreations(娱乐),or just have 6 at home?Because of these other activities,the homework can't be finished until 7 ．So their weekend homework is usually done in such a hurry that on Monday teachers are 8 and often threaten(威胁)to fail the whole class of students because they know nothing about the 9 ．If there were no weekend homework for the students to do,they would be happy to go to school on Monday 10 having a good rest and to learn what the teachers teach．