Ranked by: number of candidates
1.
Numbers (195585 candidates)
2.
Por/para (188526 candidates) 
3.
Colors (90233 candidates)
4.
Possessive adjectives (48747 candidates)
5.
Indicative Present (45629 candidates)
6.
Prepositions (40397 candidates)
7.
Masculine<=>Feminine (34683 candidates)
8.
Singular > Plural (26818 candidates)
9.
From plural to singular (12383 candidates)
10.
Por/Para3 (11416 candidates)
11.
Ser / estar - Present (9681 candidates)
12.
Opposite words (9005 candidates)
13.
Ser y Estar (8522 candidates)
14.
Por / Para - 2 (6675 candidates)
15.
Prepositions (4182 candidates)
16.
Articles (4141 candidates)
17.
La Unión europea (2507 candidates)
18.
Build these sentences (2025 candidates)
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