You're almost there! Here's the corrected and completed statement:

A combustion reaction occurs when a substance, usually containing carbon, reacts rapidly with oxygen to produce energy in the form of heat and light.

Here's why the corrections are important:

* Oxygen: The key reactant in combustion is oxygen. It's the oxygen that combines with the fuel to release energy.

* Rapidly: Combustion is a rapid reaction, meaning it happens quickly.

* Energy: Combustion releases energy, primarily as heat and light.

Let me know if you have any other questions!