Many animals died for different ____( 原因 ) .
We are____  ( 研究 ) how to improve English.
We hope live in ____ ( 和平 ) .
His____  ( 表兄 ) is a doctor.
We must ____（保护）the animals .
There are few____ （自然的）reserves in China .
Why do they want to____( 设计 )a poster.