Answer:
<em>we </em><em>have</em><em> to</em><em> </em><em>leave</em><em> at</em><em> </em><em>once</em>
Explanation:
it is important for us to leave at once
we have to leave at once
Hopeful.
Why because Enthusiastic can be describe as eager or enjoyment, interest or approval.
A. Idk i’m really guessing but it seems like the best answer