Each time ______ they met, they would talk long hours together.
| A．which | B．when | C．during | D．/ |
— You should have told her about the meaning of the gesture.
— I meant ______, but I had some unexpected guests.
| A．to do | B．to have | C．doing | D．doing so |
This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
| A．if | B．as | C．since | D．unless |
— Where did you buy this beautiful skirt?
— It was in the shop ______ my mother is working.
| A．that | B．which | C．where | D．what |
China’s hurdler Liu Xiang was disqualified due to false start in the 60-metre event, ______ his rival Dayron Robles of Cuba an easy win of 7.66 seconds.
| A．giving | B．given | C．to give | D．gave |
Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.
| A．as | B．that | C．which | D．where |