定语从句：用适当的关系词填空 we are living in an age____many things are done on computer.
I can think of many cases___students obviously know a lot of English words and expressions but could not write a good essay.
I can think of many cases___you know nothing about.
I have forgotten the date___you told me.
Do you know the reason___he is absent today?
That is the reason___I want to know.