The reason ___ he left early is still unclear.
I have a friend ___ cat is very playful.
Can you tell me ___ the next train arrives?
The restaurant ____ we had dinner last night was excellent.
She is the teacher ____ everyone admires.
He is the person ___ I was talking to on the phone.
This is the laptop ____ I use for work.
They live in a house ____ is located near the beach.
Where
Whom
That
That
Why
which
When
Whose