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

481. Vocabulary: Swimming, diving... (2690 candidates)
482. Who - What - Which (23958 candidates)
483. Infinitive implied by its particle. (3313 candidates)
484. Doing, Do, To do... (9160 candidates)
485. Choosing your past tense... (46034 candidates)
486. Tenses : satisfying the request... (2) (2085 candidates)
487. The use of tenses: a strange request...(1) (3516 candidates)
488. Either...or/ Neither...nor/ Not ... either. (13199 candidates)
489. There is / are, and other forms... (4991 candidates)
490. To be / to have: -ing forms... (4247 candidates)
491. Enough with the Present Perfect... (21276 candidates)
492. Whose and use (5056 candidates)
493. Else and compound words (3640 candidates)
494. What, which and all that (6841 candidates)
495. Possessive idioms (3067 candidates)
496. Possessive or genitive Case (27222 candidates)
497. Possessive adjectives and pronouns. (25191 candidates)
498. Adjectives: where to place them? (17520 candidates)
499. Adverbs: Where to place them? 2 (4954 candidates)
500. Adverbs: Where to place them? 1 (11769 candidates)