Ranked by: number of candidates
1.
Ten traps (25144 candidates)
2.
Should or shouldn't for your health (19163 candidates)
3.
Mind one letter (6007 candidates)
4.
At the opera house (5590 candidates)
5.
Nasty faults (5544 candidates) 
6.
Job search and common abbreviations (US) (5167 candidates)
7.
A few famous dates (4825 candidates)
8.
Presentation (4728 candidates)
9.
I'm back and back (4563 candidates)
10.
Appointment at the doctor's (4558 candidates)
11.
On the road in the USA (4490 candidates)
12.
Over and over (4485 candidates) 
13.
Small words starting with W (4408 candidates)
14.
Water and expressions (4245 candidates)
15.
Time and idioms (4154 candidates)
16.
Ads and abbreviations (US) (4034 candidates)
17.
Fore and derived words (3902 candidates)
18.
Schools and diplomas in the USA (3887 candidates) 
19.
Educational system in the USA (3729 candidates)
20.
Ten small traps (3572 candidates)
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