An user Portuguese
says…

Se
Subordinating conjunction
  não
🚫
Adverb
  o
Pronoun
  fizerem
Verb
será
Auxiliary
  entendido
Verb
  que
Subordinating conjunction
  eles
Pronoun
  escolhem
Verb
  fazer
Verb
  os
Determiner
  exercícios
Noun
  em
Adposition
  espanhol
espanhol
Noun
.

If they do not, it will be understood that they choose to do the exercises in Spanish.
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