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I. 1 do without 2 ability 3 support 4 reduce 5 betray 6 publication 7 scientist 8 challenging II. 1 tired 2 thrilling 3 boring 4 interested 5 excited III. 1 which 2 that 3 who 4 which 5 who IV. 1 b 2 b 3 c 4 a 5 a