One of the most important questions they had to consider was__________ of public health
---- There is a lot of smoke coming out of the teaching-building there.---- Really? It _____ be a fire, most probably.
This _________ girl is Mary’s first cousin, who is very lovely.
______, the concert began.
This novel is set in the modern city, San Francisco, so once _______, it will be very popular.
He has got himself into a dangerous situation ______ he is likely to lose control over the plan.