My parents like the music ____ is quiet and gentle.
Do you know the little boy ________ is helping the old man cross the road?.
I will never forget the day____ we spent in the old town with small houses.
—Would you like to see the comedy with me? —Yes, I’d love to. I like the movies ______ can make me laugh.
–Do you still remember the city ____ we visited last year ? --You mean Zhengzhou? I know there is a factory____ your mother worked.
The rubbish _____ is produced every day is becoming a serious problem in cities around the world.