1.
Global financial crisis (28126 candidates) 

2.
Can / could/ may/ might (382333 candidates) 
3.
To let / to leave (3611 candidates) 
4.
By / until (25524 candidates) 
5.
Prepositions (18974 candidates)
6.
So / such (58772 candidates)
7.
Working conditions (44892 candidates) 
8.
Quantities (35737 candidates) 
9.
Past tense and present perfect (6586 candidates)
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Adjectives (3882 candidates) 
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So , neither (18790 candidates) 
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Vocabulary- Buying and selling (55902 candidates) 
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Labour Day (5504 candidates) 
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Business (19475 candidates) 

15.
Say/tell (37550 candidates) 
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Place of adverbs (106999 candidates) 
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Tags with so/neither (26619 candidates) 
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Exclamation (65683 candidates) 
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At the hotel (22418 candidates) 
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Wrong,hurt,pain etc (6152 candidates) 
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