Thousands of people register for continuing education classes each year. To learn new skills or to improve their lives.
【正确答案】：Thousands of people register for continuing education classes each year to learn new skills or to improve their lives.
【题目解析】：不定式不能独立成句，所以我们把两个部分连接起来成为一句话，其中不定式to learn用来表示目的。