Who, which, where ,why ,when
We are talking about the book ___ we bought a week ago.
I wrote to the friend ……… had a birthday last week.
They will visit the castle........the Princess Diana lived.
Winter is the time of the year..........many people suffer from flu.
Do you know the reason............she is so upset?
I can’t understand the reason...........you have been late for work.
This is the place...........you can find everything.
The university ...........I study is near my house.
This is the reason...........I invite him to the cinema.
I remember the day............I went to school.