—The light in the office is still on. —Oh,I forgot ________.
You can hardly believe what great difficulty we had ______ on with the man.
---Could you please tell us about the activities in your school right now? --- All right. I _____ to that.
Almost _____ of the students in this class ______ glasses, that is _____ of them.
Today ________ number of people learning English in China ________ increasing rapidly.
______ is known to everybody is that the moon travels round the earth once every month.