Ranked by: number of candidates
1.
Understand a text (49661 candidates) 
2.
Right tense of the verbs. (20256 candidates) 
3.
Where are the mistakes? 3 (3120 candidates)
4.
Build these sentences (2565 candidates)
5.
Where are the mistakes ? 6 (2175 candidates)
6.
Where are the mistales ? 5 (2064 candidates)
7.
Build these sentences (2048 candidates)
8.
Build these sentences (1915 candidates)
9.
Mistakes (1880 candidates)
10.
Build these sentences (1803 candidates)
11.
Build these sentences (1771 candidates)
12.
Build these sentences (1758 candidates)
13.
Build these sentences (1374 candidates)
14.
Build these sentences (1267 candidates)
15.
Build these sentences (1235 candidates)
16.
Words (994 candidates) 
17.
What's the right word? 10 (892 candidates)
18.
What's the right word? 4 (781 candidates) 
19.
What's the right word? 7 (774 candidates)
20.
What's the right word? 9 (674 candidates)
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