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.

Sentence 1:He learnt Hindustani classical music on sarod from the Senia gharana master Ustad Keramatullah Khan . Sentence 2:However , he chose a different instrument for expressing the music he learnt .
however

Sentence 1:Float glass is annealed during the process of manufacture . Sentence 2:However , most toughened glass is made from float glass that has been specially heat - treated .
however

Sentence 1:Sarajlija remained in Cetinje more than three years -- until the spring of 1831 . Sentence 2:But he still did not have enough of Montenegro .

but