To make the firework, _____ must happen.
To light the firework, _____.
After the firework is lit, _____.
To make the firework, a combination of chemicals and explosive materials must be present and properly assembled.
To light the firework, a source of ignition such as a fuse or electric spark must be used.
After the firework is lit, it will release energy in the form of bright lights, sparkles, and various patterns or shapes depending on its design.