tests by here4u with the online test builder (650 tests)

21. Vocabulary: verbs + ing or the infinitive (4531 candidates)
22. Order of adjectives. (3617 candidates)
23. Possession - vocabulary (3610 candidates)
24. Focus sur SHOULD/ OUGHT TO: necessity and duty. (3696 candidates)
25. Resultatives (2795 candidates)
26. Confusion : to make up for something? to catch up with someb (26 candidates) [Being reviewed]
27. Focus on MUST: an ambiguous modal auxiliary. (3857 candidates)
28. Focus on MAY: Possibility and permission. (3819 candidates)
29. Focus on CAN: incapacity and impossibility. (4406 candidates)
30. Recycling waste... - Vocabulary (2898 candidates)
31. Likely/unlikely - Willing/ unwilling (114 candidates) [Being reviewed]
32. 'Whose' and idiomatic possessive forms... (4463 candidates)
33. Preference: I'd rather go.../ I'd rather you went (5151 candidates)
34. Verbs in the -ing form, or not? (5653 candidates)
35. Verbs with two object complements (3203 candidates)
36. Vocabulary: some time/ sometime/ sometimes (4530 candidates)
37. Doubling the final consonant, or not? (5216 candidates)
38. Vocabulary: steal or rob? remember or remind? (4885 candidates)
39. Civilisation: Thanksgiving and Black Friday (2919 candidates)
40. Idioms: the weather (2771 candidates)