b)    Students in growing numbers find learning has become increasingly difficult.
a)    More and more teenagers smoke cigarettes in recent years.
b)    Teenage smoking is on the rise in recent years.
a)    More and more teachers are demanded with the development of economy.
b)    There is an increasing demand for teachers with the development of economy.
大多数：most
a)    Most students take a part-time job after class.
b)    The vast majority of students take a part-time job after class.
a)    Most people take part in sports of different kinds.
b)    The considerable proportion of people take part in sports of different kinds.
a)    Most college students take a negative attitude towards smoking.
b)    The large percentage of college population take a negative attitude towards smoking.
2 句型的变化
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.