一、单项选择
1. As a teacher rich in experience, he knows how to _______ his ideas to these new students in a limited period of time.
A. convey B. educate C. conclude D. convince
2. No one can understand _______ a decision until it is too late to do so.
A. him to postpone to make B. him to postpone making
C. his postponing to make D. his postponing making
