Answer:
1)”I’m a student” Tom said.
Tom said that he was a student.
2)”I’m living in London now” Charles said.
Charles said he was living in London then.
3)”You are my best friends” Jane said to us.
Jane told us we were her best friends.
4)”I don’t know what Fred is doing” Jonny said to me.
Jonny told me that he didn't know what Fred was doing.
Sentence number 9; Sadly, even after that water is found only some of ITS clean and safe enough to drink.
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To the person who said they don’t know it same