Miss Evans taught physics in school in London．Last month       56．＿＿＿＿＿

she was explaining to one of her class about sound ，and         57．＿＿＿＿＿

she decide to test them to see how successful she had            58．＿＿＿＿＿

been in her work． She said to them， “Now I has a sister        59．＿＿＿＿＿

in Washington． If I was calling her by the phone， and          60．＿＿＿＿＿

you were on the other side of the street． Who would             61．＿＿＿＿＿

hear me first， my sister and you？ And why？”                   62．＿＿＿＿＿

A clever boy at once answered， “You sister， Miss               63．＿＿＿＿＿

Evans， because the electricity travels much faster than sound   64．＿＿＿＿＿

waves．” “Very well，” Miss Evans praised．                    65．＿＿＿___
 

参考答案：
56．第一个in后加a     　57．class→classes　      58．decide→decided  

59．has→have   　    60．by→on　      61． √       62．and→or   　

63．You→Your   　     64．去掉the                65．well→good