Sleep，as we know， is important to us． And                56． ＿＿＿＿

how many sleep do we actually need？For most                57． ＿＿＿＿

of us， eight hours seem to be about the right              58． ＿＿＿＿

amount． Yet we know that there are a                       59． ＿＿＿＿

great many people who get along well less                   60． ＿＿＿＿

sleep ，and some whom may even need more． A                61． ＿＿＿＿

great deal depends by the way we live． But                 62． ＿＿＿＿

a good common rule to follow to is to                       63． ＿＿＿＿

sleep long as we have to． So we’ll feel                   64． ＿＿＿＿

happy and be able

to work with our best when we wake．                        65． ＿＿＿＿
 

参考答案：

56．And→But       57．many→much       58．seem→seems   59．√

60．well后加with   61．whom→who        62．by→on        63．去掉第二个to   

64．long前加as      65．with→at