_______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
Next door to ours _____, who has just retired from work.
So _____ that modern industry cannot develop without it.
Scarcely _____ raining _____ the PLA fighters started on their way again.
Never _____ forget the days when _____ together with you.
Mary likes to wear beautiful _____.