Поставьте артикль the перед существительным, где нужно.
… sun is a star.
… sky is grey today.
… earth is a planet.
… weather was fine yesterday.
There are … apples on … table.
You can’t see … moon in … sky tonight.
It is very dark in … room.
I went to the shop and bought … bananas. I like … bananas.
I always help about … house.
… girls are at home. Where are … boys?