Definition: the planet that we live on Level: B1
地球大约需要365天绕太阳一周。
The ___Earth takes approximately 365 days to go round the Sun.
在这样炎热的日子里，游泳池是地球上最好的地方。
Swimming in a pool is the best place on ___Earth to be on a hot day like this.
我喜欢它，因为它是地球上最好的足球！
I like it because it is the best football on ___Earth!
