WhenIwasyoung,IhadafriendnamedMarkwholovedtomakefriends...
問題詳情：WhenIwasyoung,IhadafriendnamedMarkwholovedtomakefriends.Healwaysshowed 51 howmanyfriendshehadatschool.Onedayhisgrandfathersaidtohim,“Mark,Ibetyouabigbagofpopcornthatyoudon'thaveasmanyf...