The correct adjective that best complete the sentence here is 'Las caras están secas'.
The Spanish adjective 'secas' means 'dry' in English (in this case, 'The faces are dry').
Some examples of adjectives in Spanish are 'bueno/a' (good), 'malo/a' (bad), 'pequeño/a' (small).
In conclusion, the correct adjective that best complete the sentence here is 'Las caras están secas'.
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