Their carelessness ______ the failure. That is to say, the failure_____ their carelessness.
----What is your new Chinese teacher like, Mary? ---Oh, ____________________________.
----Did you _________ your friend when you were in Beijing? ---No. But I _________ my aunt’s during my stay there.
_____________ his homework, the boy was allowed to watch TV.
. ----Your shoes are not worth ____________. ----Well, I’m considering buying a new pair.
He ________ be more than thirty------ he looks so young, just like a teenager!