25. Thirty years ago this month，China’s leaders launched aneconomic revolution.___________the door to free market reforms and foreigntrade．

Theschoolbuswas_________bythickfog

o long as you work hard enough, a_____ rod can be ground into a needle.

My teacher is very nice．I’ll never forget the he has done for me.

In his first class,the Chinese teacher tried to_______to children that reading is one of life’s greatest pleasures.[ ]