32．_____from lightweight materials，the robots are about the size of a human arm or
smaller．

吃西瓜消暑是一件很惬意的事情，西瓜的果实和种子分别是由什么结构发育而来(    )

已知扇形的半径为6cm，圆心角为150°，则此扇形的弧长是____ cm，扇形的面积是____ cm²（结果保留π）．

_____ is your grandmother? Is she fine?

--- I’m afraid the company will not hire me.
--- Come on, Bill, relax! You have a lot of experience and fine references and your college work is ideal background for them. ______________