25. Thirty years ago this month,China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade.
Everybody was touched _________ words after they heard her moving story.
One of the most important questions they had to consider was _________ of public health.
The computer was used in teaching. As a result, not only_________, but students became more interested in the lessons.
Scientists also have no idea how long it will be before all wild animals in the cages _____.
She brought with her three friends, none of _________ I had ever met before.