1 . Billions of poor people around the world     1     (depend) on the use of wood for cooking. And as they take more and more firewood from wild areas, they are destroying habitats around the world. Wood collection is one reason why many animals have become endangered.

This is     2     Dr. Metcalf spends each summer in Africa. He wants to teach women and children in villages how to cook with the sun. He helped create Solar Cookers International. It’s an organization that introduces solar cookers to developing countries     3     teaches people how to use them.

2 . Nobody can go back and start a new beginning, ______ anyone can start now and make a new ending.

A．for	B．and
C．but	D．so

3 . Life isn’t always beautiful, ________ the struggles make you stronger and the changes make you wiser.

A．or

B．so

C．but

D．for

4 . He had a great desire to have a home of his own, ______ he had always lived with his grandmother.

A．or

B．and

C．so

D．for

5 . 1 think we'd better keep to the subject,       we'11 waste our time．

A．and

B．or

C．but

D．so

6 . I hate to admit it, _____ I think I was wrong.

A．and

B．but

C．or

D．so

7 . Dad thinks I should study to be a doctor，____ I’m not interested in medicine.

A．so

B．and

C．but

D．for

8 . Hotels fill up fast during the busy tourist season, __________it is necessary for tourists to make reservations in advance.

A．or

B．so

C．for

D．but

9 . James was enjoying the art show, _________ his wife wanted to go home.

A．or	B．for
C．so	D．but