Ranked by: number of candidates
1.
Present perfect simple / continuous / Past tense (79556 candidates) 
2.
Use of future (12090 candidates) 

3.
Past, Present perfect, Pluperfect (11427 candidates) 

4.
Global warming in the Arctic (4998 candidates) 

5.
Mayflower and Thanksgiving (3922 candidates) 
6.
Geladas and verbs (3322 candidates) 

7.
Laotian elephants and verbs (3226 candidates) 

8.
Using Right or Left (2877 candidates) 
9.
Trip in Namibia (2807 candidates) 

10.
White lions and verbs (2716 candidates) 

11.
Aletsch glacier (2627 candidates) 

12.
Double construction for verbs (2600 candidates) 
13.
Aletsch glacier 2 (2210 candidates) 

14.
Expressions (1863 candidates) 

15.
Endangered species (1495 candidates) 
16.
Terracotta Army and comprehension (1382 candidates) 

17.
Expressions and wild mammals (1096 candidates) 
18.
Herman, Arkansas, and verbs (1059 candidates) 
19.
Mystery about a portrait by Rembrandt (1018 candidates) 
20.
Funerals in Celebes 1/2 (961 candidates) 
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