Ranked by: number of candidates
1.
Present perfect simple / continuous / Past tense (80018 candidates) 
2.
Use of future (12121 candidates) 

3.
Past, Present perfect, Pluperfect (11478 candidates) 

4.
Global warming in the Arctic (4998 candidates) 

5.
Mayflower and Thanksgiving (3924 candidates) 
6.
Geladas and verbs (3326 candidates) 

7.
Laotian elephants and verbs (3240 candidates) 

8.
Using Right or Left (2878 candidates) 
9.
Trip in Namibia (2808 candidates) 

10.
White lions and verbs (2718 candidates) 

11.
Aletsch glacier (2629 candidates) 

12.
Double construction for verbs (2601 candidates) 
13.
Aletsch glacier 2 (2212 candidates) 

14.
Expressions (1863 candidates) 

15.
Endangered species (1497 candidates) 
16.
Terracotta Army and comprehension (1382 candidates) 

17.
Expressions and wild mammals (1096 candidates) 
18.
Herman, Arkansas, and verbs (1060 candidates) 
19.
Mystery about a portrait by Rembrandt (1018 candidates) 
20.
Funerals in Celebes 1/2 (966 candidates) 
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