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.

Input: Consider Input: Sentence 1:Contrary to quartz , GaPO is not found in nature . Sentence 2:Therefore , a hydrothermal process must be used to synthesize the crystal .

Output: therefore

Input: Consider Input: Sentence 1:During his tenure Carman improved the administration of the Methodist Church , promoted Sabbath observance and fought evils such as dancing , gambling and alcohol . Sentence 2:However he did not prevent , and perhaps enabled , innovation in the church 's theology and evangelical tradition to meet modern requirements .

Output: however

Input: Consider Input: Sentence 1:The vineyards survived Prohibition in the United States by producing grapes for the production of sacramental wine . Sentence 2:However , by 1940 , the vineyards and winery building fell into disuse .
Output: however