I. Revision: Networks Dangerous things in the home for children knife gas boiling water electricity drug fire II. Vocabulary (to) destroy: ph¸ huû, tiªu diÖt (to) injure sb: lµm ai ®ã bÞ th­¬ng a precaution: sù phßng ngõa, ®Ò phßng a socket: æ c¾m ®iÖn Chemicals: thuèc, chÊt ho¸ häc a bead: h¹t, vËt trßn nhá