Lesson 73 Happy Birthday ,Billy! Lesson 74 Wheres the aeroplane flying?New words birthday b:,dei 生日 year j 年 nine years old 九岁 happy hp高兴的;乐意的 Happy birthday!生日快乐 present prznt .礼物 for f:为了 Here is a present for you.这里有件礼物给 你。 Its made of chocolate它是由巧克力做的 be made of 由制成b:,dei birthday j year hp happy prznt present f: for Sandy and Sue are going to Billys house. Its Billys birthday. Billys nine years old today. “Happy birthday,Billy,” Sandy says. “Happy birthday,Billy,”Sue says. “Here is a prese