The air we breathe is freely available, withoutwe could not survive more than a few minutes. For the most part, air is available to everyone, and everyone needs it. Some people use the air to sustain them while  (sit) around and feel sorry for themselves.  breathe in the air and use the energy it provides to make   magnificent life.
Opportunity is in the same way; it is everywhere. It is so freely available that we take it   granted. Yet opportunity alone is not enough to create success; it must   (seize) and acted upon in order to have value. So many people are so (anxiety) to “get in” on a “ground floor opportunity”, as if the opportunity will do all the work. That’s  (possible).
Just as you need air to breathe, you need opportunity to succeed.  , it takes more than just breathing in the fresh air of opportunity. You must make use of it. That’s not up to the opportunity; that’s up to you. It doesn’t matter what “floor” the opportunity is on, but  matters is what you do with it.