The teacher, with 6 girls of her class, ____ visiting a museum when it happened.
_____ hardly made Mike pay any attention to _____ his mistakes.
Is this school ______you studied in three years ago?
Mr.Wang ______ the person referred to at the meeting be put in prison.
It is well known to all that water, ______ enough, can change into ice quickly.
I would love ______ to the party that evening, but I had an unexpected visitor.