Ranked by: number of candidates
541.
Complete : Melting of the glaciers (698 candidates) 
542.
Interrogative words (677 candidates)
543.
Items and furniture of the house (2) (672 candidates)
544.
Past participle (669 candidates) 
545.
Logical answer (659 candidates) 
546.
Las placas tectónicas (654 candidates) 
547.
Present subjunctive and spelling change verbs (641 candidates) 
548.
Tenses and moods (correct use) (620 candidates) 
549.
Past participle (609 candidates) 
550.
Prepositions (605 candidates) 
551.
Spelling (604 candidates) 
552.
Prepositions (600 candidates) 
553.
Imperative (positive and negative forms) (598 candidates) 
554.
Gender of nouns (591 candidates)
555.
Watching TV (579 candidates) 
556.
Synonyms (573 candidates) 
557.
Present perfect (569 candidates) 
558.
Hotel among stars (557 candidates) 
559.
Reflexive pronouns (532 candidates)
560.
Antonyms (adjectives) (526 candidates)
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