The house rent is expensive. I’ve got about half the space I had at home but I’m paying _____ here.
Is______necessary to change trains at Beijing?
When and where to build the new power station ______ yet.
_____is a good of exercise for both the young and the old.
________more attention, the work would have been done better.
Most air pollution is caused by the burning of _________ like coal, gas and oil.