15.The population of China_______to many times what it was in 1949, and most of its population farmers.
They were still working in the fields __ it had got dark.
Are you ___ to make the best of time and catch up with your classmates?
I thought it would be rainly that day, but it ___ to be fine.
The fact ___ she was often late for school made her teacher angry.
The scientist said videophone could be used ___ the conferences.