Put in the or a/an if necessary.1)Would you like to travel

Put in the or a/an if necessary.

1)Would you like to travel in . space? Yes, Id love to go to . Moon.
2)I lay down on the ground and looked up at . sky.
3)Peru is country in South America.
4)How many stars are there in sky?
5)Where is the centre of earth?
6)There are millions of stars in space.
7) sun is star.
8)Tim lives in a small village in country.
9) moon goes round earth every 27 days.
10)What is the highest mountain in world.