—________that middle school ________Beijing Normal University?—As far as I know,it is.
Accoding to the old stories of Iceland and Norway,Eric the Red was forced to leave Iceland because he had committed a murder,_______he got into trouble. A.for which B,at which C.in which D.with which
He lost his favorite watch, _________ made him very sad.
I’m going to see what Dad is________. Two hours is a long time to take over a coffee.
Professor Li is the person to ____________ you should write.
Do you know the reason _______ he was late?