我们应当总是保持我们教室干净，空气清新。
We should __________________________ and the air fresh all the time.
他们喜欢随着音乐跳舞。
They are ________________________ music.
在孙杨五岁的时候，他就开始练习游泳。
________________________________ ，Sun Yang started practicing swimming.
努力地保持冷静是地震中所要做的最重要的事。
Trying to stay calm is ________________________________ to do in the earthquake.
农民工在城市建设中，扮演者重要的角色。
Peasant-workers _______________________________ in building the cities.
我确信我们的祖国会越来越强盛。
___________________________ our motherland will become stronger and stronger.