题目内容：

1.the light in the office is still on.someone must be still working 同义句
the light in the office is still on.someone must be still ___ ___
2.想渐渐了解这些城市最好的方法是步行浏览 翻译
the best way to ___ ___ ___ the city is to visit it on foot

优质解答

1 at work
2 learn more about