Would you take my old TV in _______ for this camera?

The engineers have rejected the employers' proposals to end the strike and the other workers have come out in _____.

On the top of Mount Tai，you can get a wonderful________of the sunrise.

Soon I heard a_______like that of a door burst inand then a climb of feet.

Many firms give away small quantities of their productions as _______ so that people can try them before buying.