—— The experiment is of particular importance.—— I see. We won’t carry on with it _______ we can get the good equipment.
He became famous ______.
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.