标题：Cancel the science class requirement
原因1：no need for non-science students to take science class
原因2：too difficult for science students to register
原因1：University should hire more instructors of science class and should add more science classes
原因2：Taking science class may have unexpected connection to other subjects for example she produced flower paintings by observing flowers in science lab
标题：Dining Hall to close during Spring Break
变化：The school is planning to close the dining hall during the spring break. 1. There are not enough students on campus.2. Student could go to the restaurant in town to have some food.
原因1：There are some students on campus during the spring break. They have to stay here to study or work. In fact, the school could have another option. To open the dining hall for only an hour or to provide a smaller menu.
原因2：Going to town for food would be too time-consuming.Students want to make the best use of their time finishing their big assignments or something.
S1 Among the following jobs, which do you is most interesting one and why?
1. airplane pilot
S1 In order to protect the environment, nowadays governments encourages people to
use recycled bags, and charge for plastic bags. What are the benefits of doing so?