()coal, the most important natural fuels are the gas and oil.

单项选择题() the 2008 Olympic Games will be held in Beijing is quite clear to the people all over the world.

A. That
B. Whether
C. What
D. If

单项选择题He is neither () European, nor () American. He is from () Australia.

A. a; a; /
B. a; an; the
C. a; an; /
D. an; an; /