Fill in the Blanks Four- stroke engine. Online version Read and complete the text about four-stroke engine by Carolina Suárez 1 exhaust gases exhaust four four cylinder remaining compressed stages fuel second release stroke intake stroke spark engine mixture third power a - stroke engine is a common which works in . These are called stroke , compression , stroke and stroke . In the first step , the air and enter the . In the step , the air and fuel are . In the stage of a four - engine , heat and ignites the . Finally , in the stroke , the exhaust valve opens to the . Source : Jim D . Dearholt " Career Paths . Mechanics " Express Publishing . 201 2