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:Since the targeted user base is small for such drugs , clinical drugs tend to be quicker and cheaper than those for mass market drugs . Sentence 2:Additionally , big pharmaceutical companies have tended to ignore these markets , creating a niche with minimal competition for Alexion .
additionally

Sentence 1:He left his full - time post in 1983 to pursue a career in academia . Sentence 2:However , he maintained his link with industry through freelance consultancy and membership of several professional bodies .
however

Sentence 1:However , these amounts are not extractable without mining of the host materials ( see Production and availability ) . Sentence 2:Thus , the availability of indium is fundamentally determined by the rate at which these ores are extracted , and not their absolute amount .

thus