tests by here4u with the online test builder (683 tests)

581. Never ... Ever (1963 candidates)
582. Still /yet/ not ... yet (4706 candidates)
583. As/ However /No matter + adjective (11983 candidates)
584. Rescue .... or Revenge 2/2 (1058 candidates)
585. Rescue ....... 1/2 (1364 candidates)
586. To mind and expressions (5196 candidates)
587. Learn and remember (4074 candidates)
588. Other / (the) others ... (2485 candidates)
589. To feel, look, seem, sound ... (6570 candidates)
590. Dozen, Hundred , Thousand, etc. (6697 candidates)
591. All or Whole .... (9355 candidates)
592. The more ... the fewer ... (18133 candidates)
593. Remain/Stay/Be left (3751 candidates)
594. For /During /While (22313 candidates)
595. Extraordinary little tree (Verbal forms) (2074 candidates)
596. Most /Most of the / the most ... (8902 candidates)
597. To be dead/to die/death and LIFE (3035 candidates)
598. Such a strange trial ... 2/2 Mix of tenses (1931 candidates)
599. Such a strange trial ...1/2 Past perfect (2022 candidates)
600. Quite or Quiet (1427 candidates)