Directions for questions (11 to 14): In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If a sentence is free from error, your answer is ‘No error’.
13. One should have their teeth checked every six months.
(a) Their teeth checked
(b) Every six months
(c) No error
(d) One should have
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