英语完形填空In winter ,people always live in warm houses.They wear

英语完形填空
In winter ,people always live in warm houses.They wear warm clothes to go out .But animals c-------- do this .They always find other w------- to keep warm .Some birds fly s------ for the winter.Other animals l-------- bear find a warm hole to sleep in .Snakes can often be found in the hole in the ground d------- the winter months.