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1.
She graduates soon and I don't know what to do.
她马上就要毕业了,我不知道该怎么办。
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2.
Yes, I have a chance to get another job and I don't know what to do.
是,我有机会得到一份工作而且我不知道该怎么办。
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3.
Mary, something is wrong with your mother and I don't know what to do.
玛丽,你妈妈出了点问题,可是我不知道该怎么办。