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阅读下面短文，掌握其大意，然后从21～30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
On the way to school, a little boy found a cocoon(茧) of a butterfly and watched it almost every day. One day, it started to break through a small hole in the cocoon, but it 21 greatly. Finally, it seemed it couldn’t succeed.
On the way to school, a little boy found a cocoon(茧) of a butterfly and watched it almost every day. One day, it started to break through a small hole in the cocoon, but it 21 greatly. Finally, it seemed it couldn’t succeed.
