－Look! Everything here is under construction.－Oh, has the building once _________ for exhibition been pulled down, too?

.His conclusion, ______ on careful research, was acceptable.

____with this fiercely competitive society, _____English well and you will succeed.

Which do you feel like ________ the time on the train, chatting with friends or just reading something?

Knowing office rules—whether _____ or not—is critical, especially for young job seekers.