Indicate the underlined part that needs correction.

1. C. the environmental => the environment

2. A. Having cutting => Having cut

3. C. started do => started doing

4. D. treat the environment => treated the environment

III. WRITING

Rewrite these sentences.

1. After having identified the causes of global warming, we worked out some solutions to reduce its effects.

2. I have been writing this essay for an hour.

3. The police suspected Peter of cutting down the oldest tree in the park.

4. The man smoking a pipe over there is our new boss.

5. The city destroyed by the war has now been completely rebuilt.

6. After having talked with the environmentalist, we changed our attitude to nature.

7. Our school has been building a new canteen since June.

8. Minh denied having dumped lots of rubbish onto the beach.