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.

Ex Input:
Sentence 1:At the time , there was great concern that many of the flooded abandoned mine tunnels -- running underneath Swoyersville -- would cave - in . Sentence 2:However , the cave - ins never occurred .

Ex Output:
however

Ex Input:
Sentence 1:God first sovereignly and efficaciously regenerates , and only in consequence of that do we act . Sentence 2:Therefore , the individual is passive in regeneration , neither preparing himself nor making himself receptive to what God will do .

Ex Output:
therefore

Ex Input:
Sentence 1:A trip to Mercury requires more rocket fuel than that required to escape the Solar System completely . Sentence 2:As a result , only two space probes have visited it so far .

Ex Output:
as a result