tests by here4u with the online test builder (685 tests)

661. Present continuous (8800 candidates)
662. Forms of verbs (7469 candidates)
663. V - ing or infinitive (5394 candidates)
664. Relative pronouns (3194 candidates)
665. Prepositions and particles (1664 candidates)
666. Conditional present and past (26291 candidates)
667. Rephrasing and modals (11687 candidates)
668. For - since - ago and tenses (5943 candidates)
669. Use of tenses in a text (14231 candidates)
670. Rephrasing of verbs (4116 candidates)
671. Some forms of verbs (1829 candidates)
672. Prepositions and particles (1538 candidates)
673. To do or To make (2412 candidates)
674. To do or Not to do (1640 candidates)
675. A few difficult words (3084 candidates)
676. Question tags (1303 candidates)
677. Need of articles (2089 candidates)
678. Compound adjectives (2449 candidates)
679. Particles (1480 candidates)
680. From plural to singular (5248 candidates)