—How was your journey last week?
—Very interesting. The people there still keep the custom _____ the Ming Dynasty, which is different from other areas.
| A．dating back to | B．dating back | C．dated back to | D．dated back |
Professor Smith gave us a speech last month, ______he expressed his concern about the current global economic trends.
| A．to which | B．in which |
| C．with which | D．for which |
Susan came to the party yesterday, but it was already half past eight ______she turned up.
| A．that | B．before |
| C．until | D．when |
With all the work on hand, I ______to the cinema last night. How I regret it!
| A．shouldn’t have gone | B．might have gone |
| C．can’t have gone | D．must have gone |
The two researchers originally set out to study the zebras in Africa and discovered a new species of tiger ______.
| A．by chance | B．in addition |
| C．by nature | D．in need |
The police warned that anyone ______guilty of taking drugs in that country would be put in prison.
| A．to find | B．found |
| C．finding | D．having found |