1.Know 认识 know of/know about 知道,了解 I don’t ___ the writer,but I ____ him. 2.Difference 1)不可数 　There was not really much difference in their points of view. There’s not much difference in price between the two computers. 2)可数 　There are several important differences between cricket(板球) and football. 3)make a difference 产生差别，有影响 It makes a difference which you choose.你选择哪一个，事关重大 　It makes no difference to me whether he goes or not.