An accident ________ on Zhongshan Road yesterday afternoon.

Not until he called the secretary three times ______ that the manager went to an important meeting．

Who will send you to the new school, your mom, your dad or your uncle?— _______. I’ll go there by myself.

Danny said that he would be a doctor _______ two more years. [ ]

Newton was sitting under an apple tree ______ an apple fell onto his head.