We should bear in mind that social development and balance of nature should go  in         .  

He keeps in the safe $3 million _____ of diamonds.   

. Although Miss Black began her _______ by singing in a local pop group, she is now a famous singer in the world.

It is widely reported in the western media that the drug ______ is now becoming a leading cause of teenager crimes.  

Linda gave us a vivid          of her trip to Mount Lu shah after her return．