There was a loud cry from the backstage immediatelyafter the concert ended, _______

下列各项中加点词语的用法和例句相同的一项是（ ）例：吾家读书久不效

The air pollution is very serious,we shouldtake___________to stop it.

Millie is a friend of ______. She is also ______ classmate.

Not only the twins but also their cousin __________ Japan for half a year, but __________ of them can speak Japanese.