21. Not only the professionals but also the amateurs will _______from the new training facilities.

A) derive B) acquire C) benefit D) reward

22. The work was almost complete when we received orders to ________ no further with it.

A) progress B) proceed C) march D) promote

23. I waited for him half an hour， but he never ________.

A) turned in B) turned down C) turned off D) turned up

24. A house with a dangerous gas ________can be broken into immediately.

A) leak B) split C) mess D) crack

25. A dark suit is ________to a light one for evening wear.

A) favourable B) suitable C) preferable D) proper

21-25 BDCAB