Great attention must be devoted ________ agriculture(农业), especially in China, ______ population is the largest in the world.

In many countries more and more forests and even agricultural land are being lost to development, _______ much of the land to become desert. 

Her account made all of us ________ .

 Born in a remote village ________ by endless mountains in Yunnan, I always dream of ________ the outside world.

Have you forgotten________a ruler from Tom？Please remember________it to him tomorrow.