_________you have a rich knowledge of Chinese history, try acting as a guide for these foreign visitors.
As the busiest woman in the village, she made _____ her duty to look after all the other people’s affairs in that village.
I was given three books on sewing, the first ______ I really enjoyed.
Was it two years ago ________ they first met?
There was good food __________ abundance at the party.
It is very common that former soldiers have difficulty in ___________ civilian life.