Xiaoming is used to send a lot of cards to his friends       1.     

at new year time. And all his classmates did same. But      2.    

on one day he read a report in the newspaper, which said     3.     

that cards are made of trees. A large number of cards would    4.     

consume a lot of trees but at present more and more trees have     5.   

been cut down lead to serious floods in some areas. Xiaoming   6.     

felt shocked at the report in the newspaper and realized the    7.     

important of protecting trees, and then he shared this report    8.   

with their classmates. From now on he decides to send his     9.   

wishes to his friends by telephone instead sending cards.      10.