Question

9. Applications must reach this office ....... 13th March. Those received ......... 13th
March will not be considered.​

Answer 1

Answer:

Applications must reach this office by 13th March. Those received after 13th March will not be considered.

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Answer 2

Answer:

Application must reach office by 13th March. Those received after 13th March will not be considered.

Explanation:

• In the first filling, it is mentioned that deadline is 13th of March and one has to submit before or on this date. However, by is the best suitable word.
• In the second blank, it is cleared after proposed date the submission won't be considered. So after preposition has been used.