John, _______ university professor, is considered to be _______ success as ______ expert in the agriculture research.
This condition __________ urgent treatment. 这种情况得紧急处理。
__________ in the school regulations that students should not wear long hair or jewels.
Teachers required that all the students __________ their homework all alone.
We can see monuments here and there. Those who have made a great __________ to human beings and society will never be forgotten.
At proper horse races everyone has already studied the form of the horse __________.