Re: 5 things you want to see
Telling them to Asemble would be fine, but it wouldn't seem natural to prefix that by specifying 'Avengers' since they know who they are.
If i were them i'd be looking around and ask Steve why he's calling them specifically when there's no other heroes around to differentate from.
BEST MARVEL MOVIES
Blade • X-Men • Spider-Man • Blade 2 • X-Men 2 • HULK • Spider-Man 2 • Iron Man • X-Men First Class • Thor • Captain America: The First Avenger • The Amazing Spider-Man • The Wolverine • X-Men Days of Future Past • Guardians of the Galaxy