《强化口语》（I）作业
Direction: Give answers to the following questions. Your grades
will depend on your statements so try to organize your thoughts or ideas
to the point but be brief at the same time.
Suppose your friend invites you to attend his/her birthday this Sunday,
but you cannot make it. How would you decline this invitation politely?
Say something that you are going to do on Sunday. (100%)
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