Fill in the gap with the most appropriate word from the three choices provided.
1. To decrease pollution, cars must have an annual ______ inspection.
2. Scientists are working on ways to resurrect ______ animals, such as the wooly mammoth.
3. The so-called "simple" idea ______ into a complex project.
4. A group of people born during the same period is called a ______.
5. It is usually impossible to ______ when a natural disaster will strike.
6. The stock market crash of 1929 was a ______ event that changed the course of U.S. history.
7. ______ trash in an environmentally friendly way can be difficult.
8. The novel contains all the ______ of a best seller.
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