Exercise 10. Put the verbs in brackets in the correct form (active or passive)

1. Billions of tons of solid waste (to throw) out annually. 2. The United States alone (to produce) about 200 million metric tons of municipal solid waste each year. 3. Pollution (to have) a dramatic effect on natural resources. 4. Major physical hazards (to include) traumatic injuries and noise. 5. Pollution (to exist) in many forms and affects many different aspects of the earth's environment. 6. Until the Minimata Bay contamination (to discover) in Japan in the 1960s and 70s, most hazardous wastes legally (to dump) in solid waste landfills, buried, or dumped into lakes, rivers, and oceans. 7. Areas where wastes (to bury), called landfills, are the cheapest and most common disposal method for solid wastes worldwide. 8. Hazardous wastes of particular concern (to be) the radioactive wastes from the nuclear power and weapons industries. 9. Legal regulations now (to restrict) how such materials may (to use) or (to dispose), but such laws (to be) difficult to enforce and often contested by industry.

Exercise 11. Give definitions to the terms below:

Severe (adj) breath (n) breathe (v) smog (n) concern (v) relatively (adv) lung (n) ventilation (n) heavy (adj) allergic (adj) deadly (adv) gas (n)

Exercise 12. Put as many questions to the sentences as you can.

Many nations have adopted ambient air quality standards to safeguard the public against damaging pollutants. 2. In 1880, 2,200 Londoners died in the incident. 3. Exhaust fumes are the main cause of bad air quality. 4. A brown layer of smoke hangs in the air. 5. Air is considered safe when it contains no harmful chemicals. 6. Air pollution can irritate the eyes, throat and lungs. 7. Certain groups of people are more sensitive to the effects of air pollution than others.