【小学·完形填空·A Kind Boy】
阅读下面短文，从各题所给的四个选项中选出可以填入空白处的最佳选项。

Tom is a student in Grade Five. One day, on his way home, he saw an old woman. She was ______ a heavy bag and looked very tired.
Tom went up to her and said, "Can I help you, Grandma?" The old woman smiled and said, "Thank you, young man." Tom carried the bag to her home. The woman wanted to give him some money, but Tom said "No, thank you" and ran away.
His mother was very happy when she heard the story. She said, "You did a good thing, Tom."

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