15. Foreigner: Excuse me. How can I get to your office to apply for my police criminal record certificate? Can I take the bus? Duty officer: If you are not considering taking the MRT, you can take bus 236. Foreigner: How often does the bus leave for your office? Duty Officer: _________________________. (A) Early in the morning (B) Twenty minutes later (C) It runs always (D) In ten minutes (E) Every half an hour