Yuan Longping makes ____ possible to produce more crops in the same fields with this special strain of rice 

A child who lives in an uninteresting environment will develop less intelligence than ______ who lives in a rich and changing environment.

Farmers in Kaifeng grow a lot of peanuts every year, some of __     shipped to foreign countries．

   There we found one lion lying near the river, and ____under a tree.

______ is important to know how to get on with others when you grow up.