She understood what I was talking about, ____ it was the first time we had spoken together.
| A．whether | B．as if | C．even if | D．Since |
I soon found that the work I was doing had already been done by someone else —__________ I was wasting time.
| A．as a result | B．in the meantime |
| C．in other words | D．for one thing |
__________ with foreign countries can bring us much information about the world.
| A．Contrast | B．Competition | C．Contact | D．Combination |
—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
You may depend on __________ that they will be there on time.
| A．this | B．that | C．it | D．/ |
The old custom __________ an old country in Europe.
| A．originated from | B．dated from |
| C．got from | D．detracted from |