Please check my answer of converting active voice to passive voice

Dear Student,
Kindly make the following changes in the answers.

• had been approved by the...
• repaired before noon by the mechanic.
• Had the report, when you reached the school, been prepared by her?
• Had Mr. Gupta not been invited to the party by them?
• Flying cars would have been invented by the year 2025 by scientists.
• Before 10 o'clock all the guests would have been welcomed by us.
• Before tea break all your questions would have been answered by the lecturer.
• E-mails would have been sent out to all their employees by the evening, by them.
• Your room would have been cleaned before you reach back, by somebody.

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Thank you.