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罗斯:
You`d better prepare for the examination. 
你最好为考试做一下准备.
凯西:
I don`t think the exam will be very hard.
我觉得考试不会很难.
罗斯:
You`d better change your attitude, or you will not pass the course.
你还是改变这种态度.不然你会过不了这门课.
凯西:
Maybe you`re right. I have been too lazy lately.
也许你说得对.近来我一直很懒惰.