The research is so designed that once _____ nothing can be done to change it.

Not until I came home last night _____to bed.

The teacher told the students that there          a meeting at three o’clock.

 The employers often give the job to __________ they believe have work experience with a strong sense of duty.

The British are not so familiar with different cultures and other ways of doing things, ___________ is often the case in other countries