写出下列单词的复数形式:15%
(1)dog
(2)puppy
(3)lion
(4)baby
(5)cat
(6)piglet
(7)horse
(8)calf
(9)goose
(10)joey
(11)duckling
(12)hen
(13)mouse
(14)child
(15)knife
写出下列单词的复数形式:15%
(1)dog
(2)puppy
(3)lion
(4)baby
(5)cat
(6)piglet
(7)horse
(8)calf
(9)goose
(10)joey
(11)duckling
(12)hen
(13)mouse
(14)child
(15)knife