16. Japan has ____ its steps toward putting into effect an international treaty banning chemical weapons.
[A] hurried [B] bustled
[C] accelerated [D] rushed
17. Developing countries should adopt labour-intensive technologies to ____ their comparative advantage of abundant labour.
[A] use [B] exploit
[C] employ [D] explore
18. The tests show the earlier in life a person hears a sound the longer it is _______.
[A] retained [B] preserved
[C] remained [D] reserved
19. The researchers test college students ____ to foreign speech before their second birthday but not since.
[A] disclosed [B] exposed
[C] exhibited [D] revealed
22. The inscription on the tombstone had been ____ by the weather and could scarcely be read.
[A] worn out [B] worn down
[C] worn off [D] worn away
23. By the end of the day, the flood water which had covered most of the town had ____.
[A] receded [B] r etired
[C] replaced [D] retreated
24. I need to move to a larger apartment. Do you know of any ____ ones in this neighborhood?
[A] vacant [B] bare
[C] blank [D] empty
25. He was ____ from the competition because he had not complied with the rules.
[A] banished [B] excused
[C] disqualified [D] forbidden
26. In British history books Richard III is usually ____ as a wicked man.
[A] portrayed [B] drew
[C] explained [D] illuminated
27. The special workshop was ____ over by a famous scientist.
[A] governed [B] administered
[C] presided [D] directed
28. Grandmother has been getting more ____ lately, we have to look after her in turn.
[A] vulnerable [B] tough
[C] limp [D] feeble
29. There was a ____ of only ten centimetres between the two walls.
[A] gulf [B] space
[C] clearance [D] area
30. Although he failed in the maths test, it was wrong to ____ at his efforts.
[A] fake [B] mock
[C] scorn [D] ridicule
