Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Recentlyasurvey_______pricesofthesamegoodsintwodifferentsupermarketshascausedheateddebateamongcitizens.
Thepolicemanstoppedhimwhenhewasdrivinghomeand_____himofspeeding.
促进小组组员之间相互理解，相互接纳从而实现互动和分享的重要环节是()。
对前来寻求帮助的人，社会工作者首先需要做的工作是()。
