They will start their project,________at helping the poor children to be educated in the west of China.
Only when class began _____ that he had left his book at home.
The student couldn’t ______ what the teacher was trying to explain.
I mean ________ aboard and nothing is going to stop me, though that means _______ my parents for a long time.
It is generally considered unwise to give a child ________ he or she wants.
Six players can ________ a volleyball team while a football team is ________ eleven players.