要知道一个角是不是直角，可以用三角板的____来量一量。

     Peter is thirteen years old. He is in Grade Two this year. He likes to play football and watch football matches. And he often reads newspapers. He does his best to know where and when there is going to be a football match. Now Peter is having lunch. He is listening to the radio, too. He is very happy because there is going to be a nice football match on TV at four this afternoon. He wants to watch it very much. But he is going to have English and Chinese lessons. He thinks hard and finds a way.
“ Hello, Mrs. Black,” Peter says to his teacher on the telephone, “ Peter is ill in bed. He wants to ask for half a day’s leave ( 请半天假 ).”
“ Oh, I’m sorry to hear that.” says Mrs. Black, “ But who’s that?”
“ It’s my father, Mrs. Black.”

下图是隋朝重大历史事件的时间轴，图中的①②③代表相关的历史事件，按事件发生的先后顺序排列正确的是（    ）

在王绩的《野望》中表现秋意正浓的山景的诗句是：____，____。