早晨，当你面对太阳时，你的后面是______方．
早晨，面对太阳时，后面是西方；故答案为：西．
We collected a lot of books to get the necessary information but only half _________helpful, so we failed to finish the work.
A．is
B．are
C．was
D．were
Their classroom is _______ours. [ ]
A. next
B. on
C. in
