完全二叉树中，若一个结点没有______，则它必定是叶子结点
A、右子结点C
暂无解析
Heborrowedabooktheotherday，theauthor____isaworker.
Itisobviousthatthisnewruleisapplicabletoeveryonewithout_____.
Writing：
Anoldsayinggoes“hastmakeswaste”.Writeacompositionofabout400wordstostateyourviewonit.
Thelittleboydidn’tknow_______.
Thankyouforyourhelp,_____wecouldnothavefinishedtheworkintime.
