Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123690 candidates)
2.
Pronouns (113108 candidates)
3.
Hundred, thousand, million (88327 candidates) 
4.
Active or passive voice (71313 candidates) 

5.
Adverbs (58991 candidates) 
6.
Past simple or present perfect (55678 candidates) 
7.
Past simple (44010 candidates) 
8.
Past participle (42124 candidates)
9.
Comparatives (40344 candidates)
10.
Weather forecast (39126 candidates) 
11.
Ever/already/before/yet (37107 candidates) 
12.
Pronouns (33205 candidates) 
13.
For,since,ago (32762 candidates)
14.
Prepositions and gerund (30462 candidates) 
15.
Passive voice and tenses (28767 candidates) 
16.
Infinitive or gerund (25154 candidates) 
17.
Article The or not ? (24513 candidates)
18.
Opposite of the adjectives (23757 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22125 candidates)
20.
Reported speech (21534 candidates) 

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