（everybody ,none ,something ,anybody ,somebody ,nothing）
1.（）shouldn’t smoke in the public places.
2.（）should learm to protect animals and plants.
3.（）of us wants to be ugly.
4.I can’t find my pen ,maybe（）takes it away.
5.（）must be done to stop polluting the earth.
6.I have （）important to tell you .You can go now.