tests by greg100 with the online test builder (215 tests)
Ranked by: number of candidates
1. Some / Any / Much / Many (207007 candidates)
2. Action and Stative Verbs (95619 candidates)
3. Used to / Be Used to / Get Used to (93425 candidates)
4. Past Simple / Past Perfect / Past Perfect Continuous (87230 candidates)
5. ' ing ' or ' ed ' (75349 candidates)
6. Sport : Play, Do, Go (75246 candidates)
7. Connectors (72593 candidates)
8. Daily Routines (64180 candidates)
9. Suffixes ( - ful or - less ) (56235 candidates)
10. Shopping and Vocabulary (54072 candidates)
11. Coordinating Conjunctions (53311 candidates)
12. Tell / Say / Speak / Talk (51865 candidates)
13. Had Better or Had Better Not (49709 candidates)
14. Too Much / Too Many / Enough (48548 candidates)
15. Present , Past or Future Passive (44118 candidates)
16. Few/Little/Less (42930 candidates)
17. Each Other or One Another (42559 candidates)
18. Borrow / Lend / Loan (42217 candidates)
19. After / Before / Ago / Since / For (41553 candidates)
20. Unreal Past (40349 candidates)