1.Have you already left (you/already leave) the office when the fire started (start)?

-Words form

1/Dumping industrial (industry) waste into the lakes and rivers has caused serious water pollution

2/Many people in this area have cholera because they drink treated (treat) water

-Fill in each blank with the correct preposition

1/Land pollution is responsible for damage done to natural habitat of animals

2/Americans throw away twenty-eight and a half million tons of plastic in landfills every year.

3/ Scientist have come up with new ways of saving energy.

4/Waste water from many factories which is dumped to water bodies bodies directly causes water pollution

-Rewrite sentences

1/He produced a great idea for our environmental project

→He came up with a great idea for our environmental project.

2/People dumped toxic waste products into the rivers or landfill sites

→Toxic waste products were dumped into the rivers or landfill sites.

3/There was a loud noise next to my door last night so I couldn't sleep
→Because there was aloud noise next to my door last night

4/The tsunami happend. Many people in the area became homeless
→ The tsunami made many people in this area bacame homeless

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