There used __ a bus stop in the corner.
Professor Smith, along with his assistants, ______ on the project day and night to meet the deadline.
Class regulations require ______ is the last to leave the classroom ______ off all the lights.
He was not really in the mood for anything ______ it dawned on him that it had not been his fault.
No progress was made in the trade talk as neither side would accept the conditions of ______.
_____, in some areas the electricity was cut off, ______ residents in 8 counties spend their lunar New Year’s Eve in darkness.