He ______________（从事） in teaching in recent years and is an experienced teacher.
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The emergency________（出口） is at the back of the room.
If it's a legal matter you need to ask a _____________（专业人士） for advice.
I was so tired that I ______________（趟，伸展）on my sofa as soon as I got home.
She got off the bus looking worried and _________（疲惫的）.
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