be used for / as /by到底“怎样用”
问题描述：
be used for / as /by到底“怎样用”
答
1.Computer __ many people all over the world.2.The calculators __ working out math problems.3.The radio __ a tool in my English study.4.Stamps __ sending letters.Ⅱ.同义句转换.5.Safety glasses are use...