108. expand v. 扩大,扩张；展开,膨胀

107. expensive a. 花钱多的；价格高贵的

106. expense n. 开销,费用

105. expenditure n. 支出,消费；经费

104. expend v. 消费

103. expel v. 驱逐,开除,赶出

102. excess n. 过分,过量,过剩

101. organ n. 器官,风琴

100. optics n. (单、复数同形)光学

99. oral a. 口头的,口述的,口的