The red light is a __________ of stopping the cars.
Whether you believe it or not, it was________ caused the serious accident.
We paid ________ cash in the hope that we can get a 15% _________.
He is such a clever student _________ everyone likes.
In the end , he turned ______history teacher, who had______ good knowledge of history, especially ______ history of ______Ming Dynasty.
Peter received an e-mail just now ______ his uncle would come to see him.