Tom was walking along the riverside when he heard someone calling him from behind. He turned around_______ found nothing.
I don’t know ____ or not he is right.
—Would you like to come to our food festival? —____
The teacher asked me____________.
―Can you tell me ____________the prize, Tom? ―Last year.
―Could you tell me____________ ? ―At 2:00. Hurry! There are only ten minutes left.