7.______________v.to set apart for a particular purpose 8.______________n.the science of ideas or affairs concerning government 9.______________adj.easily broken 10.______________n.a creature that is harmful or destructive 11.______________vt.to make sth sharp 12.______________n.the development of the higher kinds of animals,plants etc.,from the lower kind 13.______________v.to make designs,shapes etc by cutting a piece of wood etc.