Tough __________ the task was, we _______ finish it ahead of time and therefore we were highly praised for it.
8. The results of the examination _____ that you have all made great _____ .
7. No one but her parents _____ it.
6. The Olympic Games _____ held every _____ years.
5. About 40 _____ of the population of that country _____ on farms.
4. _____ can be done _____ been done.