winter c_____，birds c_____find any food,because the ground i

winter c_____，birds c_____find any food,because the ground is covered with s______....
winter c_____，birds c_____find any food,because the ground is covered with s______.so some of them have to f_______to the south.but what do other animals stay in caves and s_______all winter.some animals change change their colours in winter.the wild rabbit turns from summer brows to winter white.when spring comes,everything b_______to wark up.birds fiy b_______to the north.trees h____new green leaves.farmers begin to f________land.w_______a beautiful season!