Have you had a chance to read the book Michael J. Fox wrote about his life? That ___________ is terrific!
Only a doctor can give you ___________ to make you healthy.
One of the most popular science classes in high school and college is ______ because you get to learn about living things.
The tropical rain forests are excellent locations to observe ____ in action, since there are so many different species of plant and animals living in the same space and depending on each other for survival.
We live in the ______ of planet Earth.
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