Not quite sure what you mean with hang from it; the asteroid would attract the building (much less so than Earth does, but still), so the asteroid would be "downward" for anybody close to the asteroid.In principle there is no reason why you couldn't build something on an asteroid, but that would not "hang... from the asteroid".
Yes, if the asteroid is captured by the Earth's gravitational pull.
it can not move
An asteroid can indeed damage a planet when it strikes it. It is possible that an asteroid strike resulted in the dying off of the dinosaurs on Earth. There are certainly some large craters on Earth that are suggestive of asteroid strikes.
yes, if you do not crash into an asteroid and die immediately
Usually by another asteroid moving through the belt and hitting one, creating a force to move an asteroid from its orbit. Also, if a large enough asteroid passes by, it is possible that the gravity that it generates could pull a few off.
they are called planetesimals
I does not. The asteroid would of had to knock out the entire earth for that to happen. If you think of the facts it is just not possible.
The Earth and the asteroid could be at a different points in the path.
I do not know you therefore its not possible for us to hang out.
Many things can happen if an asteroid hit the earth. Here is a list of a few consequences. There could be an explosion when the asteroid hits the earth. There could also be a tsunami if the asteroid landed in the water. Another possible consequence is a global firestorm. Another possible problem is Acid Rain. The last and final problem from this small list is temperature effects.
There was one significant asteroid impact in 1908 - the Tunguska event. It is possible that smaller asteroids hit Earth after that. There was a smaller asteroid/meteor impact more recently - the Chelyabinsk event in 2013.
There is no specific asteroid named "Abai" that is widely recognized or recorded in scientific literature. It is possible that "Abai" may refer to a fictional asteroid or a lesser-known one that has not been extensively studied or categorized.