請幫我把這些選項填入空格
(A)fish (B)cows (C)horse (D)nose (E)cat (F)neck (G)bull
(1)bury one's _________ in the sand 自欺欺人
(2)bigger __________ to fry 有更重要的事情要辦
(3)a pain in the _________ 苦事
(4)until the __________ come home 白等; 空等
(5)beat a dead _________ 徒勞
(6)brown ___________ 討好; 諂媚
(7)__________ on one's back 難以擺脫的負擔