We must ______ our forests and woodlands for future generations.

A．was an Israeli police officer to spy out military secrets
B．pretended to be an Israeli resident in the West Bank city
C．went to Palestine for a business with senior security officers
D．was arrested twice respectively by Palcstine and Israel

A．Israel's sudden attack at Palestine citizens
B．Nablus' being the most dangerous place in the world
C．Palestinians' strong hatred toward the Israel soldiers
D．the continuous chaos between Israel and Palestine