A) Complete the sentences with the new words. Read them out loud.
1. Big cities are so full of ... that even mosquitoes don't live there.
2. Take a deep ... and read all the terrible news about summer fires.
3. Clouds of ... are left by this factory every day.
4. ... happen really seldom in our surroundings.
5. ... are put into soil to make vegetables grow faster.
6. Does modern style of life ... people's health badly?