ay find the key to the math problem on page 107．—Ah, it’s so simple． I wonder whyI _ of that．

_______and three is ten.

mbs foundin Giza support the view that the Great Pyramids were built by free workers andnot slaves, ______ widely believed,

I insisted that it late and that we for the night.

There are three girls in the room, ________ is Tom’s sister.