--- I’m terribly sorry, but I made a mistake again. --- _______. Practice more and you’ll succeed.
(2012辽宁卷)Not until he retired from teaching three years ago having a holiday abroad.
It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa
The headmaster will not permit the change in the course, nor______ it a thought.
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
All the scientific evidence ____ that increasing use of chemicals in farming ____ damaging our health.