--What time do you usually get up, Rick?

--I usually get up ________ five o'clock.

1. A.
   in
2. B.
   at
3. C.
   on
4. D.
   for

?What time do you usually get up, Rick？

?I usually get up ________ five o'clock.

A. in

B. at

C. on

D. for