instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: killing microorganisms in food can be used to extend the shelf life of that food.
Sentence2: Cooking can be used to extend the shelf life of food.
answer:
be

question:
Sentence1: adding salt to a solid decreases the freezing point of that solid.
Sentence2: Water density decreases with temperature and increases with salt content.
answer:
decreases

question:
Sentence1: Muscles can only contract.
Sentence2: Something that can be smooth can only contract.
answer:
contract