_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
This is the way________I have thought of to solve the problem.
A government,which is responsible for society,must________to its people how important the method is to prevent AIDS.
His mother had thought that it would be good for his character to________from home and earn some money on his own.
We live in an age________many things are done on computer.
I have offered to paint the house________a week's accommodation.