The workers will go on strike if the demands they ______ put forward are turned down.
After two years’ research, we now have a ____ better understanding of the disease.
____ he had not hurt his leg, John would have won the race.
We all know that, __________, the situation will get worse.
---The last one __________________ pays the meal. ---Agreed!
Some pre-school children go to a day care center, _____ they learn simple games and songs.