根据句意和中文注释，写出单词的正确形式。
Aunt Liu ______________（唤醒）her son up at 6 o’clock every morning.
We read a lot of Chinese _____________（英雄）stories before the 70th Anniversary of the End of  the War of Resistance against Japanese Aggression（抗日战争胜利70周年）.
You’re late again. Can you tell me the ____________（原因）?
Mrs.Zhang is a good teacher. She teaches _____________（我们）Chinese this term（学期）.