Not until Mr. Smith came to China ___ what kind of a country she is.
| A．did he know | B．he knew |
| C．he didn't know | D．he could know |
The story showed marriage between people of different races ,_____ was against the law at that time.
| A．who | B．which | C．whoever | D．whichever |
Getting your students ___ in classroom activities is vitally important.
| A．trapped | B．devoted | C．stuck | D．involved |
Several musicians say they consider it the greatest musical composition ____written.
| A．already | B．once | C．ever | D．before |
Lewin was interested in taking research beyond books and looking at how it could ____ real social change
| A．bring up | B．bring about | C．bring in | D．bring out |
If I would have listened to those people who told me I couldn’t do it then., today ____ just be Saturday.
A will B. shall C. would D. should