—Is your mother _________ English teacher?—No, she isn’t. She is _________doctor.
They arrived at a farmhouse,in front of ________ sat a small boy.
The pen ________ he is writing is mine.
Can you lend me the book ________ the other day?
At the party,John made up a joke,________ people burst out laughing.
That is the day ________ I'll never forget.