The Shanghai World Expo is intended to achieve our common goal, world that is safer, cleaner and healthier than one we’re living in.
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.