Which of the alternatives below completes the sentence correctly?(Airport Requir...

Questão de Inglês da banca Marinha aplicada no concurso ESCOLA NAVAL (2011). Confira a resolução completa abaixo:

Which of the alternatives below completes the sentence correctly?

(Airport Requirement)Passengers (1) present their valid travel documents and boarding pass at airport security check and at the boarding gate in order to be allowed to board the airplane.