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

21. Likely/unlikely - Willing/ unwilling (55 candidates) [Being reviewed]
22. 'Whose' and idiomatic possessive forms... (4083 candidates)
23. Preference: I'd rather go.../ I'd rather you went (4690 candidates)
24. Verbs in the -ing form, or not? (5571 candidates)
25. Verbs with two object complements (3144 candidates)
26. Vocabulary: some time/ sometime/ sometimes (4431 candidates)
27. Doubling the final consonant, or not? (5111 candidates)
28. Vocabulary: steal or rob? remember or remind? (4809 candidates)
29. Civilisation: Thanksgiving and Black Friday (2819 candidates)
30. Idioms: the weather (2720 candidates)
31. Concession (4898 candidates)
32. Idioms: men and women (301 candidates)
33. Reduced forms (3925 candidates)
34. Modal auxiliaries in the past. (4763 candidates)
35. To see and to hear + ing/ bare infinitive (6350 candidates)
36. Word Stress (2) (2306 candidates)
37. Word Stress (1) (2837 candidates)
38. Pronunciation of the final sound -ED (3967 candidates)
39. A few difficulties with pronunciation (3310 candidates)
40. Vocabulary: doing things... (4165 candidates)