1. I can still remember the sitting—room______ my mother and I used to sit in the evening.
A. what B. which C. that D. where
2. He paid the boy $ 10 for washing ten windows, most of ______ hadn’t been cleaned for at least a year.
A. these B. those C. which D. them
3. All ____ is needed is a supply of oil.
A. the thing B. that C. what D. which
