1．________ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.
A．Freed B．Freeing
C．To free D．Having freed
答案与解析：A 由于free和其逻辑主语the students之间是动宾关系，所以这里用过去分词形式。free在本句中的意思是“解除(负担、义务或限制)”。
2．Hearing something ________ downstairs, I opened the door and found my brother playing football.
A．kicking B．to kick
C．being kicked D．to be kicked
答案与解析：C 分析句子结构可知，此处是非谓语动词作宾补。听到有什么东西正在被踢下楼去，something和kick之间是逻辑上的动宾关系，因此用现在分词的被动式作宾补。
