Fill in the Blanks (Reading & Writing)

The modern sandwich industry has grown far beyond its origins as a quick snack for card players. Factories now —produceproducesproducingproduced millions of pre-packaged sandwiches daily, using automated lines to slice bread and —applyappliesapplyingapplied fillings with precise consistency. Because the product —spoilsspoilspoilingspoiled quickly, distribution networks depend on refrigerated transport to —preservepreservespreservingpreserved freshness until it reaches shop shelves.