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Correct Option is only (i) and (iv)

Solution:In the given statements, (i) and (iv) have errors. In (i), replace ‘for’ with “since’ because we use for with a period of time in the past, present or future. We use since with a point in time in the past. For refers to periods of time, e.g. 3 years, 4 hours, ages, a long time, months, years. ... Since refers to a previous point in time and in (iv) ‘check in’ should be ‘check on’.
keep a check on - monitor.
check in- the act or process of reporting that you have arrived at a hotel, an airport, etc.

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