tests by greg100 with the online test builder (215 tests)
Ranked by: number of candidates
1. Some / Any / Much / Many (206612 candidates)
2. Action and Stative Verbs (95390 candidates)
3. Used to / Be Used to / Get Used to (93247 candidates)
4. Past Simple / Past Perfect / Past Perfect Continuous (86228 candidates)
5. ' ing ' or ' ed ' (75084 candidates)
6. Sport : Play, Do, Go (74967 candidates)
7. Connectors (72114 candidates)
8. Daily Routines (64167 candidates)
9. Suffixes ( - ful or - less ) (55796 candidates)
10. Shopping and Vocabulary (54020 candidates)
11. Coordinating Conjunctions (53095 candidates)
12. Tell / Say / Speak / Talk (51723 candidates)
13. Had Better or Had Better Not (49641 candidates)
14. Too Much / Too Many / Enough (48503 candidates)
15. Present , Past or Future Passive (43948 candidates)
16. Few/Little/Less (42868 candidates)
17. Each Other or One Another (42257 candidates)
18. Borrow / Lend / Loan (42138 candidates)
19. After / Before / Ago / Since / For (41400 candidates)
20. Past Perfect or Present Perfect (40231 candidates)