The following sentences may contain colon errors. Identify the answer choice that corrects these errors. (If there are no errors in the original sentence, select “correct sentence.”)
For help with this exercise, see section 28g of Focus on Reading and Writing.
Casimir force causes: objects to stick together.
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When objects stick together in machines: Casimir force causes problems.
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Casimir force can be witnessed through a common occurrence: a gecko sticking to a wall by one toe.
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To produce the effect of levitation: scientists have reversed the Casimir force so that objects repel, rather than attract, one another.
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So far, the technology only works on one thing micro-objects.
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