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:Some IGFBPs are inhibitory . Sentence 2:For example , both IGFBP - 2 and IGFBP - 5 bind IGF - 1 at a higher affinity than it binds its receptor .

SOLUTION: for example

PROBLEM: Sentence 1:Extraction of rather small amounts of U-234 from natural uranium would be feasible using isotope separation , similar to that used for regular uranium - enrichment . Sentence 2:However , there is no real demand in chemistry , physics , or engineering for isolating U-234 .

SOLUTION: however

PROBLEM: Sentence 1:WPA - RADIUS can not be cracked . Sentence 2:However , if the RADIUS authentication server itself can be cracked , then the whole network is imperilled .

SOLUTION:
however