During the days ________, he worked as a servant at the Browns. 

_________ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.

The man ___ was an old classmate of mine.

______ well, you need to have a good sense of balance. 

_______ makes the people in Shanghai proud is _______ they have achieved a lot in the past ten years.