Question 1
The addition of a small amount of platinum helped _____ the reaction between hydrogen and oxygen, causing the two gases to combine far more quickly than they would have on their own.
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Answer question 1 to unlock
Digital navigation apps have largely managed to _____ the paper road maps that once filled glove compartments across the country, as drivers now rely almost entirely on real-time GPS guidance.
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Answer question 2 to unlock
A sudden collapse in investor confidence can _____ a sharp drop in stock prices, since frightened sellers begin unloading their holdings almost immediately after troubling news breaks.
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Answer question 3 to unlock
The city planted rows of trees along busy roads to _____ the effects of air pollution; the vegetation absorbed a portion of the exhaust gases before they could spread into residential areas.
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Answer question 4 to unlock
With the widespread adoption of low-cost 3D printers, custom-made products have begun to _____ in home workshops everywhere, as hobbyists produce everything from phone cases to replacement furniture parts.
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Answer question 5 to unlock
After reaching its peak brightness during the full phase, the moon's visible surface begins to _____ each night, and by the end of the month only a thin crescent remains in the sky.
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Answer question 6 to unlock
Because demand for airline tickets rises sharply in summer and falls in winter, ticket prices tend to _____ considerably over the course of the year rather than remaining at a stable level.
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Answer question 7 to unlock
When a company stops introducing new products and fails to respond to shifting consumer preferences, its sales can begin to _____, with revenue leveling off for months or even years at a time.
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Answer question 8 to unlock
Without regular conditioning exercises, an athlete's flexibility and range of motion can _____ noticeably over just a few months, making it harder to compete at a high level.
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Answer question 9 to unlock
Engineers attached a secondary sensor array to the robot's navigation system to _____ its ability to detect nearby obstacles, giving the machine a wider field of awareness than its original cameras could provide.
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