Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123253 candidates)
2.
Pronouns (112808 candidates)
3.
Hundred, thousand, million (88066 candidates) 
4.
Active or passive voice (71116 candidates) 

5.
Adverbs (58690 candidates) 
6.
Past simple or present perfect (55286 candidates) 
7.
Past simple (43621 candidates) 
8.
Past participle (41944 candidates)
9.
Comparatives (40257 candidates)
10.
Weather forecast (39009 candidates) 
11.
Ever/already/before/yet (36923 candidates) 
12.
Pronouns (33028 candidates) 
13.
For,since,ago (32611 candidates)
14.
Prepositions and gerund (30434 candidates) 
15.
Passive voice and tenses (28589 candidates) 
16.
Infinitive or gerund (25063 candidates) 
17.
Article The or not ? (24490 candidates)
18.
Opposite of the adjectives (23712 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22120 candidates)
20.
Reported speech (21521 candidates) 

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