_______250,000 species of fossils have been discovered in both organized, scientific searches and by sheer accident.

Laser discs provide images of _______ than those of either television signals or video tapes.

As a rule, _______ the heart rate, the faster the pulse.

_______ tilted toward the sun, the more heat it receives and the hotter it is.

Jays are_______ and more colorful than crows.

Of the two sisters, Linda_______

Which group of languages has the _______ vest forms?

The woman was so beautiful_______

The curriculum at the public school is as good_____ of any private school.

The greater the number of bacteria attacking the system_______

Although both are mammals, the early stages of development on the part f placentals fifer from _______ of marsupials.

I'll write to you_______ I can.

The bed is not clean enough_______

Often weighing_______ 100 pounds, large dogs are used to pull sleds in the snow.

The old man and the Sea, a novel about an old fisherman's harrowing adventure catching a huge fish, is one of Ernest Hemingway's_______ book.

This book is_______ to understand.