tests by here4u with the online test builder (670 tests)

501. Vocabulary: Swimming, diving... (2709 candidates)
502. Who - What - Which (24310 candidates)
503. Infinitive implied by its particle. (3360 candidates)
504. Doing, Do, To do... (9342 candidates)
505. Choosing your past tense... (47746 candidates)
506. Tenses : satisfying the request... (2) (2121 candidates)
507. The use of tenses: a strange request...(1) (3615 candidates)
508. Either...or/ Neither...nor/ Not ... either. (13433 candidates)
509. There is / are, and other forms... (5058 candidates)
510. To be / to have: -ing forms... (4292 candidates)
511. Enough with the Present Perfect... (21763 candidates)
512. Whose and use (5438 candidates)
513. Else and compound words (3723 candidates)
514. What, which and all that (6995 candidates)
515. Possessive idioms (3099 candidates)
516. Possessive or genitive Case (27573 candidates)
517. Possessive adjectives and pronouns. (25700 candidates)
518. Adjectives: where to place them? (17662 candidates)
519. Adverbs: Where to place them? 2 (5060 candidates)
520. Adverbs: Where to place them? 1 (12011 candidates)