We must be home________ 6 o'clock.A.by B.in C.on
Last week,Liu Tao _________his English teacher.
一Did you have a good time? 一Yes__________.
一What did you do just now? —I__________ some juice.
She __________ to school at 7:00 every morning.But yesterday,she______to school at 7:30.
Where __________ David and Jack last Sunday?