Fill in the gap with the most appropriate word from the three choices provided.
1. Commentators disagree about the extent of the president's _____ power.
2. Eastern Monarch butterflies ______ many miles to winter in Mexico.
3. The ______ for obtaining a patent or trademark is complicated.
4. The phrase, "______ of the fittest," is related to the theory of natural selection.
5. The spill of liquid latex into the river may ______ the city's drinking water.
6. More donors are needed when, after a major holiday, blood supplies are ______.
7. My roommate sleeps all day because he works the night ______.
8. Have you seen the Sierra Nevada mountain _____?
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