Yes. It has happened before.
Yes, a bullet shot into the air can come down with enough force to cause serious injury or death. This is known as a "falling bullet" or "stray bullet" phenomenon, and it is important to never shoot a firearm into the air as the bullet can still retain lethal velocity when descending.
No, a bullet fired straight up will lose its velocity as it reaches its peak height due to air resistance, and will fall back down at a much slower speed than when it was fired. It is highly unlikely for it to come down with enough velocity to kill someone. However, firing a gun upward is still dangerous as it can cause harm if it hits someone when falling back down.
Bite the bullet means to do what you have to do, unpleasant as it is, but better in the long run than not doing it. A wounded person without anesthesia might have to endure extreme pain, which could cause him to bite his own tongue or cheeks, causing even more damage on top of whatever had already happened to him. Someone might give him a bullet to bite, so he could focus on it and not bite unpredictably.
I assume what you are asking is "if you shoot a gun straight up in the air will the bullet come down at the point where it was shot from". The answer to that question is NO, the rotation of the earth will move the point of impact.
It could be likely that he just wanted to show that he could get someone as good as you, but he also could just be afraid of commitment.
It could come to life if someone studied nonstop.
Are you approaching them sexually or just as a friend that feels awkward now that this has come to light? You could just be honest and straight forward. Just like you would any other person.
You could come with your friends and confront straight on, or try to get him alone to talk to him. Flirt
why would you ask that?
When someone says come again, it is a more polite way to say what, indicating you did not hear them. It could also be a short way of asking someone to come back, as in thanks, come again.
If you are trying to come between a couple that is just wrong and you just don't do anything. If you want to break up with someone then be straight forward, honest and polite.
Often you cannot tell. Someone who is gay will tell you at some point if they come to terms with their sexuality--and if you have shown yourself to be someone they can trust with this knowledge.