Julius Caesar when crossing the Rubicon, reportedly said, "Alea iacta est," which means "the die has been cast."

Both "Quidquid id est, timeo Danaos et dona ferentis." and "Arma virumque cano!" are from the Aeneid by Virgil.

The remaining two quotes are also Julius Caesar, "Veni, vidi, vici." was what he said about his military campaigns in England, and "Et tu, Brute?" was what he said when he laid dying in the Senate, stabbed by the senators.

"Ambulaverunt" is the only answer that is both in the perfect tense and matches the subject, "puellae," in number and gender.

"Tenuit" is the only verb in the perfect tense to agree in person and number with the subject, "miles."