阅读下面短文，掌握其大意，然后从短文后各题所给的A、B、C三个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
A boy and a girl were playing together. The boy had a lot of small glass 1. The girl had some candies with her. The boy told the girl that he would2her all his balls in exchange for (交换) her candies. The girl thought that was a good3.
But the boy didn't give4of his balls to the girl. He kept the biggest and the5ball in his pocket and gave the others to the girl. 6the girl gave him all her candies.
That night, the girl had a 7sleep, but the boy didn't sleep well. He kept thinking whether the girl had 8some candies from him.
You think in the way you do things. If you don' t give your hundred percent(百分之百) in a relationship, you'll 9 keep thinking if the other person has given his or her hundred percent. This is true for any relationship.
Give your hundred percent to everything you do and you'll find that you can always10a lot of happiness.
