二、单项选择(本题共有10小题, 每题1分,共10分)In ______ fact, I don’t understand what the engineer means, but I have got_______ rough idea of his plan.
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.