I. Choose the best answer A, B, C or D
Global warming is mainly caused by the increase of __________ gases in the atmosphere.
A. oxygen
B. greenhouse
C. nitrogen
D. hydrogen
Cutting down forests will __________ the problem of global warming.
A. reduce
B. prevent
C. worsen
D. control
Many animals are in danger of __________ because of climate change.
A. pollution
B. extinction
C. protection
D. population
We should use public transport more often to reduce carbon __________.
A. effect
B. emission
C. resource
D. damage
The polar ice caps are melting __________ global warming.
A. because
B. because of
C. although
D. despite
II. Give the correct form of the words in brackets
Global warming has serious __________ effects on human life. (HARM)
People should raise their __________ of environmental problems. (AWARE)
Using renewable energy helps reduce environmental __________. (POLLUTE)
III. Rewrite the sentences without changing the meaning
The Earth is getting warmer because people burn fossil fuels.
→ The Earth is getting warmer because of __________________________.
People should save energy to protect the environment.
→ Energy ________________________________________________.
