Choose the correct answers

I learned a lot about wildlife until/ after I visited Cuc Phuong National Park yesterday.

Choose the correct answers

We saw many beautiful birds while we ____ in the lake.

Choose the correct answers

Land pollution is responsible for damage done ___ natural habitat of animals.

Choose the correct answers

___ fumes from these vehicles are serious air pollutants.

Choose the correct answers

Too much use of electric lights in cities may ______ light pollution.

Choose the correct answers

Air pollution occurs when the atmosphere contains gases, dust, or fumes in ___ an amount.

Choose the correct answers

____ she left the party, Jenny said goodbye to the host.

Choose the correct answers

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