Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123620 candidates)
2.
Pronouns (113039 candidates)
3.
Hundred, thousand, million (88282 candidates) 
4.
Active or passive voice (71300 candidates) 

5.
Adverbs (58891 candidates) 
6.
Past simple or present perfect (55666 candidates) 
7.
Past simple (43978 candidates) 
8.
Past participle (42107 candidates)
9.
Comparatives (40343 candidates)
10.
Weather forecast (39092 candidates) 
11.
Ever/already/before/yet (37102 candidates) 
12.
Pronouns (33169 candidates) 
13.
For,since,ago (32743 candidates)
14.
Prepositions and gerund (30454 candidates) 
15.
Passive voice and tenses (28757 candidates) 
16.
Infinitive or gerund (25140 candidates) 
17.
Article The or not ? (24508 candidates)
18.
Opposite of the adjectives (23742 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22125 candidates)
20.
Reported speech (21534 candidates) 

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