Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123590 candidates)
2.
Pronouns (113028 candidates)
3.
Hundred, thousand, million (88258 candidates) 
4.
Active or passive voice (71290 candidates) 

5.
Adverbs (58856 candidates) 
6.
Past simple or present perfect (55645 candidates) 
7.
Past simple (43970 candidates) 
8.
Past participle (42093 candidates)
9.
Comparatives (40340 candidates)
10.
Weather forecast (39078 candidates) 
11.
Ever/already/before/yet (37094 candidates) 
12.
Pronouns (33158 candidates) 
13.
For,since,ago (32736 candidates)
14.
Prepositions and gerund (30454 candidates) 
15.
Passive voice and tenses (28754 candidates) 
16.
Infinitive or gerund (25134 candidates) 
17.
Article The or not ? (24504 candidates)
18.
Opposite of the adjectives (23737 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22125 candidates)
20.
Reported speech (21534 candidates) 

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