根据句意及汉语提示写出单词。 Let's meet at the school _______ (大门) at 8:00 a.m. _______ (总统) Obama visited China last month. The news is an ________ (鼓舞人心的事) to all of us. In my opinion, this is his greatest ________ (艺术作品). The beautiful model is made of _______ (金属).