我们居住在同一个星球上,我们要共同爱护它。
We are living on the same planet.
窗户旁边有一架钢琴.
There is a piano .
我想邀请他参加我们的俱乐部.
I want to join our club.
Though I can't watch my favorite program tonight,it's not a big deal.
You are supposed to ask your teacher for help.
It serves you right.