Question

what should happen if oxygen stops to support combustion?_make a guess if it is the situation for what other work fuels are useful​

Answer 1

Answer: Oxygen only makes up about 20 % of the atmosphere, not the majority.  The majority is actually nitrogen (N2) which constitutes about 78 %.

Oxygen doesn't burn on its own though, it needs a fuel.  That fuel is your match stick, when that fuel is gone, it stops burning.  There's nothing else to burn so the fact that there's a decent amount of oxygen around isn't dangerous.