按正确顺序排列下列句子。( ) First, make a big ball of snow.
( ) Third, make a smaller snowball than the second and put it on the top.
( ) Let's make a snowman.
( ) Then make a face and a nose on the snowman.
( ) And at last (最后), put two sticks for his arms.
( ) And then, put some little rocks for his mouth and eyes.
( ) Second, make another small snowball and put it on the big one. 2, 4, 1, 5, 7, 6, 3