他们一大早就动身去伦敦旅行了.
They for London on a holiday early in the morning.
陆地上什么动物最重?
所有的教室昨天都打扫了一遍.
As the old saying goes, God helps those who help (他们自己).
The man is happily (描述)what he saw during his winter vacation.
It's good manners to keep your (声音) down in public.