__________ some medals came to live in the sea is not known.
| A．Which | B．Since | C．Although | D．How |
－I'm afraid that I couldn't pass the examination.
－As a student，you need to believe in yourself________you have the ability to achieve any________goal.
| A．knowing；to be set | B．knowing；set | C．known；setting | D．known；to be set |
－Sir，may I borrow some new books?
－Sorry，you can't________you haven't turn back those you borrowed one month ago.
| A．unless | B．before | C．because | D．until |
In general，she is devoted to her studies，but she________be little naughty at times.
| A．will | B．can | C．should | D．would |
________，everybody agrees the suggestion that the prize should be sent out to the hero by mayor.
| A．Identical | B．Typical | C．Classical | D．Physical |
Though Li Na didn't win the gold medal in Australian Open Tennis Championships 2013，her performance________higher praise.
| A．brought up | B．brought about | C．brought in | D．brought out |