Emma is very busy in the moming. She gets up at half past five. After brushing her teeth, she ____. She usually does sports for thirty minutes. Next, she helps to make breakfast. At half past six, she eats breakfast. For breakfast Emma usually has bread and milk. She____ eats hamburgers. Hamburgers are unhealthy. Emma needs a healthy ____. After breakfast she____ her room. Then she goes to school. Emma usually____to school. She says walking is good for her.

照明供电线路的路端电压基本上是保持不变的，可是我们在晚上七八点钟用电高峰开灯时电灯比深夜时要显得暗，这说明在用电高峰期（   ）