完形填空 Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more（1）1waiting for the final school bell. Upon its（2）2everyone would run for their coats and go home, everyone except David.
David was a small boy in ragged clothes. I had often（3）3what kind of home life David had, and what kind of mother could send her son to school dressed so（4）4for the cold winter months, without a coat, boots, or gloves. But something made David（5）5. I can still remember he was always（6）6a smile and willing to help. He always（7）7after school to straighten chairs and mop the floor. We never talked much. He（8）8just simply smile and ask what else he could do, then thank me for letting him stay and slowly（9）9home.
Weeks passed and the（10）10over the coming Christmas grew into restlessness until the last day of（11）11before the holiday break. I smiled in（12）12as the last of them hurried out the door. Turning around I saw David（13）13standing by my desk.
“I have something for you,” he said and（14）14from behind his back a small box（15）15it to me, he said anxiously, “Open it.” I took the box from him, thanked him and slowly unwrapped it. I lifted the lid and to my（16）16saw nothing. I looked at David's smiling face and back into the box and said, “The box is nice, David, but it's（17）17.”
“Oh, no, it isn't,” said David. “It's full of love. My mum told me before she died that love was something you couldn't see or touch unless you know it's there.”
Tears filled my eyes（18）18I looked at the proud dirty face that I had rarely given（19）19to. After that Christmas, David and I became good friends and I never forgot the meaning（20）20the little empty box set on my desk.
