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:Another strong car , the # 29 of Jeff Burton , worked his way through the field following an unscheduled pit stop . Sentence 2:However , on lap 158 , his engine blew while challenging Mark Martin for the lead .
however

Sentence 1:However her entry only managed eight and last place in the semifinal . Sentence 2:However , her entry charted on the Sverigetopplistan Singles chart reaching number 12 based on downloads following her performance .
however

Sentence 1:The second pre-production train was also tested on the Victoria line during engineering hours , and was expected to begin trial running in full passenger service in July 2008 . Sentence 2:However , this date slipped twice , first to January 2009 and then to July 2009 .

however