Children need friends ______ their own age to play with. 
#7484
A
of
B
for
C
in
D
at
推荐题目
This new-type machine ____.
#7375
A
takes up many rooms
B
take up much room
C
takes up many room
D
takes up much room
Climbing Mount Everest          great skills and        not without risk.
#6097
A
requires;are
B
required;were
C
requires;was
D
requires;is