Not only ________learn a foreign language, but also ______ master it well.

I’m hoping that John will let us have the car tonight; __________, I’m afraid we won’t be able to go out.     

When the newspaper boy got to a blue door,________,which frightened him away as fast as possible.

We have been told that under no circumstance ______ the telephone in the office for personal affairs.

Nobody would stand out admitting the fact，for some reason，________ they lost the game.