“猫捉老鼠”是天经地义的事，然而有人却发现正在哺育后代的母猫也能接受并喂养刚出生的小老鼠（其体表涂有猫的尿液），而且还不伤害它们．
My friends thought they had made things very smooth for me, but I felt there was still much to ________ with.
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