Fill in the blank using a meaningful phrase: Make sure that you _____ at least two hours before your flight is due.
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Correct option is
The phrase, 'check in' means 'to report your arrival, esp. at an airport or hotel, so that you can get the service you are paying for'. As this phrase conveys a clear meaning when used in the given sentence, option D is correct.
The phrase, 'check off' means 'to mark as verified, examined, etc.' Eg: After I finished shopping, I took my shopping list and checked off all the items.
The phrase, 'check out' means 'settle one's hotel bill before leaving'. Eg: I checked out of the hotel at 11 a.m. today and reached the airport at 11.30 a.m.
The phrase, 'check up' means 'to make certain about something by checking it'. Eg: Please check up the train timings once again before you leave home.
Given the meanings as above, the phrases given in options A, B and C cannot be used in the blank to form a meaningful sentence. Hence, these options are incorrect.