If you're talking to one of your adult friends and talking in the past tense, you can add some words in front of the sentences so it can make a bit more sense. Ex. "When you were a kid, what did you want to be when you grew up?" For the first sentence, I would talk to a child under the age of 18. I would reword it a little. Ex. "What do you want to be when you grow up?"

In some cases, 'Hot' can be referred to as 'Fever', but not all the time. When you say to someone, "I'm hot." They might think you are either talking about how your body is reacting to the heat due to the weather conditions, or they might think you're talking about yourself, as in attractiveness.

The first part of the sentence is good, but for the second part, I would replace "See anything." With "Acknowledge anything." "When I'm focused on something, I don't acknowledge anything else around me."

To answer your question honestly, I would memorize it by heart, because many english speakers do use "Look" in that particular sentence. And for the word "Find", I would add the word " Out" after it. That makes sense too. "Someone is at the door. Go and find out who it is." And for the second sentence, all of the answers are acceptable, but you can change the question a bit too, but the one that you've used is fine as well. Another way to reword the sentence can be "The prices of books are getting () these days." Both are fine.

I would personally use "A man is a man as long as he keeps his word." I would say it sounds more natural and it rolls off the tongue better.