Complete the crossword.

Across

5. People take this when they are ill (noun)

6. The time of day when people travel to and from work (noun)

7. To put harmful things into the air or water (verb)

Down

1. To get better (verb)

2. Too many people in one place (adjective)

3. A place where things are made with machines (noun)

4. Food that is unhealthy (noun)