How to keep track of the kids?

Do you know the English expression “to keep track of” something? If you “keep track of “ something, you always have a good, up-to-date knowledge of it. Here are some examples to help you understand the way we use the expression.

Molly is an air-traffic controller. She works at a busy airport, and her job is to guide planes into the airport safely. She needs to keep track of all the planes which arrive at the airport.

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