Do you play Ant Forest？ It is （1）　　online game on Alipay （支付宝）． Players （2）　　（collect） "energy" by doing something environmentally﹣friendly． They can grow and water （3）　　（they） own "trees" with the "energy"． （4）　　 the "trees" are big enough， Alipay with some other companies will plant real trees in the desert （沙漠）area of China． Every year millions of trees （5）　　（plant） in this way．

    This is part of China's tree﹣planting program． It hopes （6）　　 （stop） the desert from becoming larger． Since 1978， China has planted over 66 billion trees （7）　　 the north． It is known as "the Great Green Wall"．For example，Saihanba in Hebei Province was once a desert， （8）　　 now it has become the biggest man﹣made forest in China．

    "China is making the world much （9）　　 （green） than before． It sets a good example and has many （10）　　（lesson） to share with the world，'' said the United Nations Environment Program．