tests by here4u with the online test builder (627 tests)

501. Future and Conditional (9371 candidates)
502. Numbers and dates... (Level 1) (18998 candidates)
503. Numbers and Dates... ( Level 2) (8123 candidates)
504. I'd better... I'd rather... (24101 candidates)
505. When : What tense to put behind... (31934 candidates)
506. Vocabulary: Animal sounds/cries (12426 candidates)
507. Vocabulary: Emergency - First aid... (29056 candidates)
508. Expressing time: by... , by the time..., once... (5989 candidates)
509. Before - In front of - Opposite... (8601 candidates)
510. Vocabulary: Swimming, diving... (2716 candidates)
511. Who - What - Which (24472 candidates)
512. Infinitive implied by its particle. (3376 candidates)
513. Doing, Do, To do... (9442 candidates)
514. Choosing your past tense... (48224 candidates)
515. Tenses : satisfying the request... (2) (2189 candidates)
516. The use of tenses: a strange request...(1) (3623 candidates)
517. Either...or/ Neither...nor/ Not ... either. (13536 candidates)
518. There is / are, and other forms... (5116 candidates)
519. To be / to have: -ing forms... (4320 candidates)
520. Enough with the Present Perfect... (22009 candidates)