Situational dialog test

Here is the situational dialog test which I wonder which one is the best answer.

Situation: Kevin and Mark are talking about their friend Jake and his new car.

Kevin : Have you heard the latest about Jake?
Mark : No. __1__
Kevin : He just bought a brand new car… a really expensive one.
Mark : That doesn't surprise me. He's very rich now. He sold his
apartment in town a few months ago.
Kevin : ___2___ He took out a loan at the bank last week.
Mark : Is that so?...Well, anyway ___3___
Kevin : It's a Mercedes - a newly imported one. Look! Here he
comes. You can ask him about it.

1. 1. Where is he?
2. How was he?
3. What about him?
4. Will he be okay?
5. What does he do?

2. 1. That’s exciting, isn’t it?
2. How do you know him?
3. How nice of him!
4. That's wonderful.
5. You must be kidding.

3. 1. What color is his new car?
2. How much did he pay for it?
3. Where did he buy his new car?
4. What make is his new car?
5. How about his new car?

I think the answers are 5 , 5 and 4 respectively. Are they correct?

In item 1, I'm not sure between What about him and What does he do
In item 3, I'm not sure between What make is his new car? and How about his new car?

Please help me find the best answers, Thank you.