Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123862 candidates)
2.
Pronouns (113256 candidates)
3.
Hundred, thousand, million (88359 candidates) 
4.
Active or passive voice (71322 candidates) 

5.
Adverbs (59021 candidates) 
6.
Past simple or present perfect (55698 candidates) 
7.
Past simple (44141 candidates) 
8.
Past participle (42155 candidates)
9.
Comparatives (40382 candidates)
10.
Weather forecast (39138 candidates) 
11.
Ever/already/before/yet (37109 candidates) 
12.
Pronouns (33235 candidates) 
13.
For,since,ago (32777 candidates)
14.
Prepositions and gerund (30464 candidates) 
15.
Passive voice and tenses (28804 candidates) 
16.
Infinitive or gerund (25174 candidates) 
17.
Article The or not ? (24516 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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