Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123470 candidates)
2.
Pronouns (112918 candidates)
3.
Hundred, thousand, million (88200 candidates) 
4.
Active or passive voice (71266 candidates) 

5.
Adverbs (58810 candidates) 
6.
Past simple or present perfect (55612 candidates) 
7.
Past simple (43879 candidates) 
8.
Past participle (42070 candidates)
9.
Comparatives (40330 candidates)
10.
Weather forecast (39056 candidates) 
11.
Ever/already/before/yet (37073 candidates) 
12.
Pronouns (33121 candidates) 
13.
For,since,ago (32687 candidates)
14.
Prepositions and gerund (30447 candidates) 
15.
Passive voice and tenses (28733 candidates) 
16.
Infinitive or gerund (25124 candidates) 
17.
Article The or not ? (24501 candidates)
18.
Opposite of the adjectives (23730 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22125 candidates)
20.
Reported speech (21529 candidates) 

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