Помогите с английским (домашкой)

Question

Исправьте ошибки: 
1. I see the plane i a sky. 
2. A lot of factories pollute our the atmosphere. 
3. Sun is a biggest star in our galaxy. 
4. People went to moon in the 20th century.

Анатолий Алексеев · Accepted Answer

I see the plane and sky. 
A lot of factories pollute our atmosphere. 
Sun is the biggest star in our galaxy. 
People were going to the moon in the 20th century.