at the root of, extremely necessary or important, to have a particular purpose, the main cause of something, to wait before making a decision, serve a function, to have a particular purpose, cases in which people are taken to hospital, the main cause of something, something that wastes a huge amount of time, monumental waste of time, extremely necessary or important, a system involving changing the clocks, to be caused by something, something that wastes a huge amount of time, sleep on it, to have a particular purpose, to wait before making a decision, cases in which people are taken to hospital, the main cause of something, be down to, to wait before making a decision, something that wastes a huge amount of time, a system involving changing the clocks, to be caused by something, hospital admissions, the main cause of something, to have a particular purpose, cases in which people are taken to hospital, extremely necessary or important, absolutely vital, extremely necessary or important, to be caused by something, something that wastes a huge amount of time, a system involving changing the clocks, daylight saving time, cases in which people are taken to hospital, a system involving changing the clocks, the main cause of something, to wait before making a decision

Controlled practice — Exercise 1

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