. We have finally finished it! When ______ the job if we had started it a week earlier?

She showed the visitors around the museum, the construction ________had taken more than three years.(2011·江西)

Sent to the zoos in Beijing and othercities, the monkeys are reported ______.

We had _______ 7-day holiday during this National holidays, but some of us felt unhappy because of _________heavy traffic on the highways.

Why did they keep trying _________ they must have known it was hopeless?