What country has no rivers?
B4. Hard to believe it, but there is such a country! Libya (LOCATE) in North Africa and borders on the Mediterranean Sea.
B5. It’s the (FIFTEEN) largest country on Earth. But more than 90 percent of Libya is desert, and there’s not a single permanent river in Libya!
B6. This huge country, more than four times the size of California, has a (SMALL) population than a number of cities in California.
B7. Libya (BECOME) an independent nation in 1951.

A lesson on efficiency
B8. I remember my last year at school very well. There were three boys (NAME) William in my class.
B9. Miss Fisher, one of the teachers, called them all William, and we (NOT KNOW) which one she was talking to.
B10. One day, during a lesson on efficiency, she thundered, “William, put that gum you (CHEW) in the wastepaper bin at once!” All three of them started to rise, paused, then walked to the front of the class to dispose of their gum. The teacher beamed. “Three for one! Now that's efficiency.”