一、单项选择（每小题1分，共10分）
1.I failed in the final examination last term and only then _____ the important of studies.
A. I realized B. I had realized C. did I realized D.did I realize
2.The maths teacher asked his students to ____the straight line___5 equal parts.
A.separate…from B.separate….into C.divide…into D.divide…from
