Recreational facilities may include ______.
A. water
B. electricity
C. gas
D. inside swimming pools
【B7】
A. depend
B. depend on
C. to spend
D. depends
Cataracts is a kind of illness that ______.
A. must lead to blindness
B. can not be treated by operations
C. can be cured
D. can change the color of eyes
【B11】
A. what
B. who
C. where
D. which