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

581. Should ... (Step 2) (1561 candidates)
582. V- ing or infinitive (4770 candidates)
583. Should ( Ought to) (9599 candidates)
584. Never ... Ever (1974 candidates)
585. Still /yet/ not ... yet (4720 candidates)
586. As/ However /No matter + adjective (12054 candidates)
587. Rescue .... or Revenge 2/2 (1082 candidates)
588. Rescue ....... 1/2 (1378 candidates)
589. To mind and expressions (5216 candidates)
590. Learn and remember (4086 candidates)
591. Other / (the) others ... (2494 candidates)
592. To feel, look, seem, sound ... (6584 candidates)
593. Dozen, Hundred , Thousand, etc. (6706 candidates)
594. All or Whole .... (9391 candidates)
595. The more ... the fewer ... (18240 candidates)
596. Remain/Stay/Be left (3797 candidates)
597. For /During /While (22531 candidates)
598. Extraordinary little tree (Verbal forms) (2077 candidates)
599. Most /Most of the / the most ... (8947 candidates)
600. To be dead/to die/death and LIFE (3042 candidates)