The driver was at_________loss When ________word came that he was forbidden to drive for speeding.
It was probably at that moment _____ I understood what kindness really was.
—What was it that caused the party to be put off?—________ the invitations.
Who ________ that played a trick on the new English teacher?
—Where did you pick up the stamp?—It was at the post office ________ we worked in the summer vacation.
—Was it by cutting down staff ________ she saved the firm?—No,it was by improving work efficiency.