Help needed in grammar, changing sentences in Direct Speech to Reported Speech.?

Question

Here are the sentences to change:
1) The distinguished scientist said, "The search to fight deadly diseases like cancer and AIDS is gaining momentum with the passing of each day."
2) "Come here and fight like a man, you coward!" Tom challenged Jerry.
3) "This is outrageous. Imagine being charged ten dollars for a plate of chicken rice!" boomed the customer as he looked at the bill.
4) "Kate did not participate in the art contest," said David.
5) She said, "Sit down and tell me the whole story."

Answer 1

In a way, it is so simple. In order to transform direct speech to reported speech, take away the speech marks and amend the sentence.

David was heard to say Kate did not participate in the art contest.

She asked me to sit down and tell her the whole story.

"Does that make sense?", Darestobelieve asked, or does that make sense Darestobelieve was heard to ask.

Answer 2

I think it is something like:
4) David said that Kate did not participate in the art contest.
Maybe you can try the rest..