1. The loss of forests can have a __________ impact on the environment.

C. negative
2. Greenpeace is an international group that protests against anything which is a __________ to the environment.

A. threat
3. Global warming is making __________ weather events, such as hurricanes and droughts.

A. extreme
4. The host asked Peter __________ tea or coffee.

A. whether he preferred
5. I asked him __________ but he said nothing.

C. what the matter was
6. Illegal trade in animal body __________ can lead to the disappearance of many animals.

A. parts
7. The loss of forests can destroy the natural soil and lead __________ climate change.

B. to
8. Air pollution is a major __________ that has serious effects on our health.

C. issue
9. Some animals lose their habitats because of __________

C. deforestation
10. We should __________ action to protect endangered animals.

D. take
11. __________ she agreed, you would have done it.

B. Had