[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
20. The government has provided the capital library with heavy ____ to keep it one of the largest in the world.
[A] subscriptions [B] tips
[C] subsidies [D] bonuses
21. Birds play a large part in plant reproduction by ____ seeds across large areas.
[A] dispersing [B] disseminating