根据句意及首字母提示完成空格中所缺的单词。 1. His father often goes abroad and he can speak several foreign l_______. 2. China is one of the largest c_______ in the world. 3. My son likes eating hamburgers. He says they are very d_______. 4. Listen! S_______ is knocking at the door. 5. Will you please d_______what your English teacher looks like?