I was chatting on the Internet last night when I smelt something   in the next room．

There are lots of plastic bags ____ in the river, ____ it very dirty.

To their surprise, the boy’s wound was left ______.

-- Have you considered _____ your job as a teacher?　 --- Yes. I like the job because a teacher is often considered _____ a gardener.　 

_______ that he might lose his job, Peter always works extra hours to please his boss.