--- Is this your sister’s key, John? --- No, it isn’t. ______ is in the bag.
Before the police , the alien left the shop .
We didn’t know the good news ______ he told us.
There _________ a computer in everyone's house in the future.
My sister can’t cook, I can’t, ________ .
Please give me ________envelope, I want to write a letter to my father.