A variety of reasons have led me to choose this occupation over other more lucrative ones. First,teaching is learning. To make my lectures more interesting, I have to read more books, explore new knowledge and gain a better understanding of the world—the very thing I like to do in my life. Second, teaching means freedom. As a teacher, I can freely express my opinions and explain them in my own way since nobody will interfere with me. Finally, I like teaching because it offers a certain peace of mind. No more rushing to catching a morning bus, no more anxiety to please a boss, and no more worries about being laid off because you are getting old.
文中有4个词的短句First, teaching is learning.也有27个词的长句To make my lectures more interesting, I have to read more books, explore new knowledge and gain a better understanding of the world—the very thing I like to do in my life.有简单句,也有复杂句As a teacher, I can freely express my opinions and explain them in my own way since nobody will interfere with me；还有同位语句，断裂句，排比句，比较句等,因而文章读起来节奏感强。所谓句子变化，主要是指句子的开头要有变化，句子的结构要有变化，句子的长度要有变化。不要连续使用几个简单句，要学会使用复杂句。
例2
a) Teenagers are pressured by school work. They are also encouraged by their peers. Under such circumstances, they resort to smoking. But sometimes they feel a little guilty.
b) Pressured by school work and encouraged by their peers, teenagers often resort to smoking, tough they feel a little guilty sometimes.