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11. Animal experiments will continue to be necessary to resolve existing medical problems ________( 尽管一些人公开反对 ).
12. Professor Clark was a bit strict with us, ________( 但我们确实从他那里学到了很多 ).
13. The more you explain, ________( 我愈糊涂 ).
14. He has done so much for the poor in his community that ________( 再怎么赞扬他都不过分 ).
15. Since my childhood I have found that ________( 没有什么比读书对我更有吸引力 )
