Read the following advertisement/announcement and mark the letter A, B, C or D on your to indicate the correct option that best fits each of the numbered blanks from 10 to 15

----- Nội dung ảnh -----
Ladies, and Gentlemen.
The captain has turned off the seatbelt sign, which means you can leave your seat now if you wish. However, for your safety and the safety of others around you, you must keep your seatbelt (10) _____ while you are seated. (11) _____ the seatbelt sign comes on again during the flight, please return immediately to your seat.
Should you wish to remove anything from the overhead lockers, please take care, as some items may have moved during take-off and could fall out on you or other passengers.
Passengers are reminded that this is a non-smoking flight, which means that smoking is not allowed anywhere in the aircraft, including the toilets which (12) _____ by smoke detector alarms. As a reminder, the non-smoking sign will remain illuminated throughout the trip.

Question 10: A. fastened B. fastening C. Should D. Had
Question 11: A. Do B. Were C. was not protected D. Had
Question 12: A. is not protected B. are not protected C. was not protected D. were not protected