Question

change into passive question is someone stole some top secret documents from the secretariat
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Answer 1

the ans is:

Some top secret documents were stolen from the secretariat by someone.

Here by someone is optional i .e. I if u wanna write u can if u dont then also you will get correct

Answer 2

HERE IS YOUR ANS ⤵⤵⤵⤵⤵⤵⤵

SOME TOP SECRET DOCUMENTS WERE STOLEN BY SOMEONE FROM THE SECRETARIAT

Hope this ans helps u..