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Christopher __2__ (know) she always had a lot of work，and he wanted to help.In his bedroom there was a toy steam-engine which his father __3__ (buy) him as a gift.“I __4__ (make) better use of it，”little Christopher said to himself.So，when his mother __5__ (not use) her sewing-machine，he fixed the toy steam-engine onto it.When the job __6__ (finish)，he was quite pleased，thinking his mother __7__ (like) it. “Very clever，”his mother said，when she saw it.Then she sat down and went on turning the wheel by hand.“I __8__ (work) like this for too many years，” she explained. This taught Christopher the lesson that anyone who __9__ (try) to improve anything __10__ (have) to learn：Many people don't like new ideas. 答案 1.turned [表示对现在的虚拟，用一般过去时。] 2.knew [一般过去时表示过去的动作。] 3.had bought [表示“过去的过去”用过去完成时。] 4.will/shall make [此处用一般将来时表示临时的决定或安排。] 5.was not using [过去进行时表示过去某一时刻或某一段时间内正在进行的动作。] 6.was finished [一般过去时的被动语态。] 7.would like [过去将来时，相对于过去某一时刻而言即将发生的动作或存在的状态。] 8.have been working [用来表示从过去某一时刻开始一直持续到现在(还要继续下去)的动作。] 9.tries [一般现在时表示经常发生的、习惯性的动作、客观真理、科学事实等。] 10.has [同上题。] | 
