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: Moisture is required for the microorganisms to grow. 
Sentence2: Moisture can cause infections to grow.

Answer: Moisture


Question: Sentence1: With a spatula, fold in flour mixture. 
Sentence2: a sifter is used for separating flour.

Answer: flour


Question: Sentence1: landfills have a negative impact on the environment. 
Sentence2: Solid waste is stored in landfills.

Answer:
landfills