The Earth's orbit lasts for 365 days and Pluto's orbit takes 249 YEARS! ... The earth has one moon, Mars has two very small ones, Jupiter, the giant of ... Venus is the hottest planet in the Solar System, even hotter than Mercury, ... A Martian day is 24 hours and 39 minutes long, less than an hour longer than a day on Earth.
I believe the correct answer is exercitui. You need the perfect passive form here, which is formed when you combine the verb esse in the present tense (here, sunt because of third person plural), and the appropriate participle in the same person, which in this case is exercitui - third person plural.
