根据句意及首字母航及汉语提示补全单词。(15分)
1、Beijing is a big c_________(城市).
2、There are s______(六个) apples in the bag.
3、I’m t________( 十二) )years old.
4、My favourite food is e_______( 鸡蛋 ).
5、These are my p_______( 父母 ).
6、There are five o_______(办公室) in our school.
7、He's m_______(我的) friend.