题目

Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more anxious, waiting for the final school bell. Upon its     1  everyone would run for their coats and go home, everyone except David David was a small boy in ragged clothes. I had often wondered what kind of home life David had, and what kind of mother could send her son to school dressed so   2  for the cold winter months, without a coat, boots, or gloves. But something made David    3. I can still remember he was always   4  a smile and wi如图，已知∠BAC=∠DAE=90°，AB=AD，要使△ABC≌△ADE，还需要添加的条件是________．