Put in a/an or the in these sentences where necessary. I'm just going to ____ post office. I’ll be right back. There were no chairs, so we had to sit on ____ floor. Have you finished with _____ book I lent you? My sister has just got a job in _____ bank in Manchester. We live in _____ small flat near the city centre. There's ____ big supermarket at the end of the street I live in.
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