Before leaving home, make sure to turn off the electricity, lock the door, ______ the windows open.
As time went by, the plan stuck ____ fairly practical.
It was believed that things would get worse, but ____ it is they are getting better.
The students spent as much time getting trained as they ____ studying.
——Did your sister pass the exam? ——She failed and is in low spirits. ——I’m sorry for her. ——____.
That she hadn’t kept her ____ on her work resulted in the failure.