WhenIwasyoung,IhadafriendnamedMarkwholovedtomakefriends...
问题详情：WhenIwasyoung,IhadafriendnamedMarkwholovedtomakefriends.Healwaysshowed 51 howmanyfriendshehadatschool.Onedayhisgrandfathersaidtohim,“Mark,Ibetyouabigbagofpopcornthatyoudon'thaveasmanyf...