—Mark，you look so tired．
—Oh，I didn’t go to bed________it was 12 o’clock last night．
A．unless
B．after
C．until
D．as
Lily is over there，and she is talking to a friend________the phone．
A．on
B．in
C．by
D．for
I didn’t stop working________it was quite late．
A．when
B．after
C．before
D．until
Sometimes most of us probably are angry________our friends，parents or teachers．
A．to
B．with
C．at
D．for
David is________than his brother．So he always makes more mistakes．
A．careful
B．more careful
C．less careful
D．the most careful
I learned________a horse last year，and now I’m good at it．
A．ride
B．rode
C．to ride
D．riding
