某学者进行了一场学术演讲，演讲提纲如右图所示，你认为，该学者演讲的主题是
--- Could you please clean the room? --- _____ I have to do my homework.
—Do you like swimming? —Yes, swimming is a good way _______ fit.
She got up early this morning _________ she could catch the first bus.
This year our school is __________ than it was last year.
One of the suspects is ____ schoolboy.
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