12.　 Asia has half of the world’s p________

11.　 England has many I______

10.　 The biggest country in Europe is R_______

9.　　　 A s______ is usually part of an ocean

8.　　　 Let’s plan the tree　 in the e______

7.　　　 A v______ is smaller than a tomn

6.　　　 The tap is l_______ .you can’t use the water that leaks out.

5.　　　 People work together to make our e______ clean.

4.　　　 The Rochy mounts are the biggest m______ in North America.

3.　　　 North Amercia covers about 24 milion s______ kilometers.