be used for / as /by到底“怎样用”

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be used for / as /by到底“怎样用”
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be used for / as /by到底“怎样用”
be used for / as /by到底“怎样用”

be used for / as /by到底“怎样用”
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 used for protecting your eyes.Safety glasses are used your eyes.Key:1.is used by 2.are used for 3.is used as 4.are used for 5.to protect