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Stick …on an envelope.(a letter , a stamp)
Write…on an envelope.(an address, a label)
Nick is expecting …from his friend.(an envelope ,a pillar-box, a letter)
Her parents posted her…last week and she has just got it.(an address, a parcel , an evelope)
If you send a telegram it will be delivered…than a letter.(quicker, slower)
Most post-offices are…on Sundays.(closed, open)