It is estimated that ，currently, about 50，000 species become _____every year ．

The destruction of the twin towers _________shock and anger throughout the world ．

Successful learning is not a(n)________activity but consists of four distinct stages in a specific order

John says that his present job does not provide him with enough ______for his organizing ability.

All her hard work __________in the end ，and she finally passed the exam ．

The opportunity to explore and play and the encouragement to do so Can ________the performance of many children ．

In order to live the kind of life we want and to be the person we want to be ，we have to do more than just ________with events ．

In 1991，while t11e economies of industrialized countries met an economic_____，the economies of developing countries were growing very fast ．

The poor countries are extremely _______to international economic fluctuations

The interactions between China and the US will surely have a significant_______on. peace and stability in the Asia .—Pacific region and the world as a whole.