TASK DEFINITION: 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.
PROBLEM: Sentence1: Without light there is no sense of vision. 
Sentence2: Glass causes a sense of vision.

SOLUTION: sense

PROBLEM: Sentence1: Fertilization occurs naturally in the fallopian tubes. 
Sentence2: fertilization is used for reproduction.

SOLUTION: Fertilization

PROBLEM: Sentence1: Milk was loaded with bacteria that quickly spoiled, making it undrinkable. 
Sentence2: milk can be made undrinkable by bacteria.

SOLUTION:
Milk