25. When asked by the polite, he said that he remembered ____ at the party, but not _____.

A. to arrive, leaving　 B to arrive, leave　 C. arriving, leaving　 D. arriving, to leave

24. He glanced over at her,　 ___ that though she was thin, she seemed very well put together.

A.　　 having noted　 B . noted　 C. to note　 D. noting

23. the pilot asked all the passengers on board top remain ___ as the plane was making a landing.

A. seat　 B seating　 C seated　 D to be seating

22.he looked around and caught a man ____ his hand into the pocket of a passenger.

A. put　 B to be putting　 C. to put　 D putting

21. having been ill in bed for nearly a month, he had a hard time ___ the exam.

A. pass　 B　 to pass　 C passed　 D passing

20. don’t leave the water ____ while you brush your teeth.

A. run　 B running　 C being run　 D to run

19. the flu is believed ____ by viruses that like to reproduce in the cells inside the human nose and throat.

A.　　 causing　 B being caused　 C to be caused　 D be have caused

18. my adviser encouraged ____ a summer course to improve my writing skills.

A. for me taking　 B me taking　 C for me to take　 D me to take

17. the disc, digitally ____ in the studio, sounded fantastic at the party that night.

A. recorded　 B recording　 C to be recorded　 D having recorded

16. the flowers ____ sweet in the botanic garden attract the visitors to the beauty of nature.

A. to smell　 B smelling　　 C smell　 D to be smell