A．They will become too hard to plough.
B．They will soon be overgrown with Kudzu.
C．People will have to rely on kudzu for a living.
D．People will find it hard to protect the soil.

A．The lights were not working that night.
B．There were lights there since she saw them.
C．The man should have seen the light.
D．The school could have easily solved the problem.