TASK DEFINITION: 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.
PROBLEM: Sentence 1:All trace of that entrance has vanished , for the whole southwestern section of the walls underwent many extensive alterations over the centuries . Sentence 2:However , that stretch of wall appeared in a print produced in the 18th century .

SOLUTION: however

PROBLEM: Sentence 1:She feels sad on having put them through such troubles and begs them to return before she leaves the country . Sentence 2:They however refuse , saying that they stay has actually made them better than they were in the city .

SOLUTION: however

PROBLEM: Sentence 1:In late 2007 AMI Jet Charter 's air carrier certificate was revoked by the FAA due to alleged operational control violations . Sentence 2:However , there is ongoing speculation the FAA had other motives other than operational control .

SOLUTION:
however