1过去式：became
过去式题目：
1. It _became_ (become) a main force that would regenerate society. 它成为改造社会的一个主要力量。
2. Eventually I _became_ (become) one of the family. 实际上我成了那个家庭的一员。
3. On that day, you _became_ (become) the child of someone and the sibling of others. 从那天开始，你就成为某个人的孩子，并且有了兄弟姐妹。
4. They _became_ (become) lovers after she recovered. 在她痊愈之后，他们成了情侣。
5. As I waited, I _became_ (become) aware of something happening in the house. 我在等待的时候，感觉到房子里发生了什么事。
2过去分词：become
过去分词题目：
1. Talents, especially senior talents, have been _become_ (become) one of the most important strategic resources for state development in the economic era of knowledge. 在知识经济时代，人才，特别是高层次人才已成为国家发展的最重要战略资源。
2. In my pocket, that photograph pulsed with an incessant force: I understood that it had _become_ (become) my heart. 在我的口袋里，那张照片以持续不断的力量搏动着：我明白它已经成了我的心脏。
3. By 1980 the imbalance between the business and social sectors of society had _become_ (become) intolerable. 直到1980年，商业和社会部门之间的不平衡已经变得无法忍受。
4. Wiley Post was a hero. He had _become_ (become) the most famous pilot in America. 威利.波斯特就是一位英雄，他已经成为美国最著名的飞行员。
