1- est
2- prendrons
3- sera
4- quitterons
5- arriverons
6- étais
7- avons vu
8- était
9-sommes aller
10- ai vu
11- avais volé
12- étais tombé
13-avait eu
À usually means 'to' or 'at' and can be used to refer to nouns and timings. Au is the masculine form of à and is used in place of à to refer to masculine nouns (but not proper names). En means 'in' and is also used to refer to nouns.
a) Nous n'avons pas de classe en mai.
b) Il finit la classe à midi.
c) Au printemps, il y a des fleurs.
d) Le professur comence la classe à 9 heures.
e) En hiver, la neige tombe.
f) La rentrée de l'école est au mois de juin.
g) En automne, il pleut.
h) En été, il fait beau et chaud.
2. Choisir can be conjugated as a special -IR verb. Because of the article vous, we know that the ending of the word will be -ez. As shown through all -IR verbs, the ending of this word specifically would be -issez. Combined with the root of the word, chois, you would get the word choisissez.
3. Finir can be conjugated as a normal -IR verb. Because of the article nous, we know that the ending of the word will be -ons. As shown through all -IR verbs, the ending of this word specifically would be -issons. Combined with the root of the word, fin, you would get the word finissons.
I hope this helps! Bonne chance!
Aujourd'hui, nous sommes vendredi. Hope this helped you! <3