赚现金
I heard a girl sing in the next room.(改为被动语态)
A girl heard sing in the next room.
The scientists released the picture of a black hole to the world on April 10.(改为被动语态)
The picture of a black hole to the world by the scientists on April 10.
A middle school student invented a new robot last term.(改为被动语态)
A new robot by a middle school student last term.
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