根据句意，用括号内所给动词的适当形式填空。
More than one person_________(clean) the classroom at 6 o’clock yesterday.
— Is London the first European city _____(hold) the Olympic Games?
—No, it has been held in many other places in Europe.
Not only the students but also the teacher _________(ask)to go to school on time now.
She __________ (live) in this city for years when I met her in 1990.
People should save electricity by ________ (not leave) lights on when they are not needed.