__________ entered the office when he realized that he had forgotten his report.
---Kate returned home last night. ---Really? Where_________?
---Are the food and clothes_________the quake-hit area? ---Yes, they will be flown there ahead of time.
It was in that country_____he studied for his doctor’s degree____he fell in love with the girl.
It is strongly suggested that measures________factories to pour waste into rivers by the government.
— How long do you think it will be _______ the USA recovers from the losses of the financial crisis?— Perhaps four or five years.