I
1.They are_____that people use energy-saving bulbs to save energy.
A.please     B.pleased      C. pleasing      D.pleasure
2.You should turn____ the gas after you have finished cooking.
A.on            B.off               C.up                D.down
3.My mother was very tired,____I helped her with the housework.
A.because  B.although     C.so                 D.but
II
1.They live____in a small village.(Happy)
2.You should spend your money and energy as____as possible.(Economy)
3.I want to see the___of environment from the local authority.(protect)
4.We can save natural resources by____bottles and cans.(recycle)
5.The old man walked____to the park.(slow)
6.He is_____beause they have used electricity to catch.(disappoint)
III
Tropical rain forests are found in Amazon region of South Amercia,Central America,Africa,and Southeast Asia.Rain forests are very important to the world's climate.The Amazon rain forest alone receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world's oxygen.Some scientists believe that the decresing size of rain forests will affect the climate on earth, making it uncomfortable or even dangerous for life.Saving our rain forests is an international problem.One country or even a few countries can not solve the problem alone. The nations of the world must work together to find a solution before it is to late.
*Answer the questions:

• 1.How are the rain forests to the world's climate? ___________________________
• 2.Does Amazon rain forest produce about 30 to 40 percent of the world's oxygen?________________________________________________________________
• 3.Where are tropical rain forests found?__________________________________