My dad, ........... travels a lot, is in Australia at the moment.
WHO
The DVD recorder, ............... I bought just a few days ago, is not working.
WHICH
The tennis court, ............. they usually play, is currently not available.
WHERE
She rents a house. It is very small
She rents a house WHICH is very small.
Instagram is an app ....... is very popular.
WHICH
He is a poet. His works are widely known.
He is a poet WHOSE works are widely known.
Here is the book. It's really boring.
Here is the book WHICH is really boring.
I am going to London. Big Ben is located in London.
I am going to London, where Big Ben is located.
I passed the test. The test was very difficult.
I passed the test, which was very difficult.
The customers thanked the waiter. He smiled.
The customers thanked the waiter, who smiled.
