Answer:
What has many keys but can't open a single lock?
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?