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.

Q: Sentence 1:The AV receiver is classified as an audio frequency electronic amplifier . Sentence 2:But with the rapid addition of several features , AV receivers now generally have significant additional functionality .

A: but
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Q: Sentence 1:Raye has had successful years as a run - based offensive coordinator , namely with the 1984 Los Angeles Rams , when Eric Dickerson rushed for a league - record 2,105 yards . Sentence 2:However , his recent success has been questionable .

A: however
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Q: Sentence 1:Cragen and his detectives later determined that the wife of the boy 's biological father killed his mother and gave the baby to the adoption agency , where he was given a home . Sentence 2:In the end , the boy 's biological father won custody of him .

A:
in the end
****