单项选择题
It was believed that there was no limit（）the energy resources on our earth.
A．for B．off C．to D．on
单项选择题 The lecture hall in the university has a seating（）of over 2 000, but that night only 1 000 people were present.
单项选择题 The work（）by the time you get there.
单项选择题 We'll begin to（）the new plan next month.
