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Use "keep an eye on" in a sentence
"There are several things that can cause the thymus to atrophy, or decrease in size, which in turn leads to an insufficient number of these regulatory T cells being educated to keep an eye on other T cells."
"Nevertheless, the king had arranged to keep an eye on Philotas through an unexpected source."
"But I worked the old Carson Drew magic on them, and they agreed to keep an eye on you for twenty-four hours."