Ranked by: number of candidates
1.
Possessive adjectives and pronouns (123261 candidates)
2.
Pronouns (112816 candidates)
3.
Hundred, thousand, million (88073 candidates) 
4.
Active or passive voice (71120 candidates) 

5.
Adverbs (58693 candidates) 
6.
Past simple or present perfect (55293 candidates) 
7.
Past simple (43654 candidates) 
8.
Past participle (41945 candidates)
9.
Comparatives (40257 candidates)
10.
Weather forecast (39011 candidates) 
11.
Ever/already/before/yet (36923 candidates) 
12.
Pronouns (33033 candidates) 
13.
For,since,ago (32614 candidates)
14.
Prepositions and gerund (30435 candidates) 
15.
Passive voice and tenses (28597 candidates) 
16.
Infinitive or gerund (25066 candidates) 
17.
Article The or not ? (24491 candidates)
18.
Opposite of the adjectives (23713 candidates)
19.
Rudolph, The Red-Nosed Reindeer (22120 candidates)
20.
Reported speech (21521 candidates) 

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