It was the A/N1H1 epidemic ____ spread almost throughout the country ____ promoted the research and production of the flu vaccine.
No one in the department but Tom and I _________ that the director is going to resign.
________ their teacher coming, the pupils pretended to be reading aloud.
Would you be so kind as to tell me _______ of the five policemen will be sent to Hong Kong?
---Did you watch the program Voice of China on Friday night? It was wonderful.---I wish I had, but I ________ for the mid-term examination then.
Mrs Black finds it hard to clear up the mess, as the kids are always _______ whenever she tries to.