25（）

A．Because most black holes are so far away.
B．Because the gravity of a black hole is so strong that it sucks the light inward.
C．Because as the star’s gases burn, it stops giving off heat and light.
D．Because as a star cools, its outer layers pull in toward its center.

A. I prefer
B. that’s OK
C. I’d love to
D. What do you like
E. Would you like to go
F. That sounds fine
G. cannot work
H. have to work late