1 the reason why he is late is that he is ill
2 this is the school where we study
3this is the date when my brother joined the army.
He failed in the examagain, which was unexpected．
He didn＇t pass the exam, which made his mother angry．

i don't know the reason why he left.
Do you know the reason why he cry?
This is the place where i live
China is the place where i live/
Do you know the time when he left?
Do you know the time when he got married?
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然耸立,它是一百多年前建造的.)
Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了,他曾经是我的老师.