(2013山东枣庄)By the time I locked the door，I realized I________my keys at home．
A．had repaired
B．had changed
C．had forgotten
D．had left
(2013四川宜宾)—“Food Safety”has become one of the hottest topics recently．
—Yeah，it receives________Internet hits(点击)a day．
A．thousands
B．thousand of
C．thousands of
D．ten thousands
(2013广东佛山)The Xiamen-Shenzhen high speed railroad will run________eight cities．
A．across
B．through
C．over
When the door bell ________I was listening to music．
A．went off
B．went out
C．broke down
D．set off
Yesterday I met Sandy．We________each other since________middle school．
A．haven’t seen；finished
B．haven’t seen；finishing
C．hadn’t seen；finished
D．hadn’t seen；finishing
—What did Bob ask you just now?
—He wanted to know how long________when he reached the cinema．
A．the film had started
B．the film will start
C．the film had been on
