He transplanted the little tree to the garden _____ it was the best time for it.
Many world leaders ____ to reduce poverty and help the poor live better at the conference.
Government should make sure ____ all sculptures are kept well when removed.
In America, many people waste a lot of food _____ in Africa people haven’t enough to eat.
What _____ surprise! He has won the game without making great ______.
Playing balls together is a kind of activity_____ every player needs to be well-cooperated together.