It was about 600 years ago ______the first clock with a face and an hour hand was made .
| A． that | B．until | C．before | D．when |
It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa
| A．when | B．that | C．after | D．since |
The headmaster will not permit the change in the course, nor______ it a thought.
| A．does he even given | B．he even gives | C．whether | D．he will even given |
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
| A．who | B．that | C．where | D．before |
All the scientific evidence ____ that increasing use of chemicals in farming ____ damaging our health.
| A．show; are |
| B．shows; are |
| C．show; is |
| D．shows; is |
（2012江苏卷） There is little doubt in your mind that he is innocent, _______________?
| A．is there | B．isn't there | C．is he | D．isn't he |