Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123848 candidates)
2.
Pronouns (113232 candidates)
3.
Hundred, thousand, million (88350 candidates) 
4.
Active or passive voice (71321 candidates) 

5.
Adverbs (59016 candidates) 
6.
Past simple or present perfect (55697 candidates) 
7.
Past simple (44135 candidates) 
8.
Past participle (42153 candidates)
9.
Comparatives (40376 candidates)
10.
Weather forecast (39135 candidates) 
11.
Ever/already/before/yet (37109 candidates) 
12.
Pronouns (33233 candidates) 
13.
For,since,ago (32774 candidates)
14.
Prepositions and gerund (30464 candidates) 
15.
Passive voice and tenses (28800 candidates) 
16.
Infinitive or gerund (25170 candidates) 
17.
Article The or not ? (24515 candidates)
18.
Opposite of the adjectives (23766 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22128 candidates)
20.
Reported speech (21535 candidates) 

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