In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Example Input: Sentence 1:Such boats are suitable for ponds , lakes , rivers and seas during calm weather . Sentence 2:However , due to light weight , they are susceptible to waves and windy conditions .
Example Output: however

Example Input: Sentence 1:It is presumed to have a large population , and generally lives within the confines of protected areas . Sentence 2:Therefore , it is unlikely to decline at the rate needed to be listed as an endangered species .
Example Output: therefore

Example Input: Sentence 1:In simulations of solid systems , the strain field arising from any inhomogeneity in the system will be artificially truncated and modified by the periodic boundary . Sentence 2:Similarly , the wavelength of sound or shock waves and phonons in the system is limited by the box size .
Example Output:
similarly