1.
Thanks to...? or Because of...? (2280 candidates) 
2.
Direct or indirect interrogatives: patterns. (2807 candidates) 
3.
How often...? or How many times...? (3749 candidates) 
4.
So many T H O U ...R... (2954 candidates) 
5.
Tricky plurals (4314 candidates) 
6.
To LEAVE/To LET (4112 candidates) 
7.
Quantifiers (some, any, no) (3824 candidates)
8.
Reflected pronouns? Reciprocal pronouns? (4233 candidates) 
9.
Chimney? Fireplace? or Mantlepiece? (4 candidates)
[Being reviewed]10.
Prepositions: in transportation. (5355 candidates) 
11.
'Remember'? or 'Remind'? (4577 candidates) 
12.
Buying shoes (3702 candidates) 
13.
Vocabulary: at the hairdresser's (3003 candidates) 
14.
'Almost similar words' part 2 (4769 candidates) 
15.
'Almost similar words': part 1. (5214 candidates) 
16.
Phrasal verbs (3122 candidates) 
17.
'You and me'? or 'You and I'? (5304 candidates) 
18.
How long...?/ Since when...?: tenses. (5937 candidates) 
19.
'Used to' or 'would'? (5423 candidates) 
20.
'Than', 'as' or '(that)? (7579 candidates) 
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