In which of these sentences should "who" be replaced with "whom"?

In his latest update, John Smith ______ that the server upgrade could take seven days longer than expected.

If you have any questions, please contact Mr. Brown or _____.

Which word indicates possession?

What is the correct noun form of the verb 'appear'?

Jim said, '_____ not fair that Sally hasn't received a raise. She's a hard worker!'

'This is Ken' is used when:

For all __________, this meeting is over.

'What are the _____ of our victory in this election?'

Your supervisor needs the report no later than 72 hours from 3 pm today. When's the latest you should have it done?

When adding a signature to a letter or e-mail, the order (top to bottom) should be...