Помогите пожалуйста с 3 заданием))даю 25 балов)

1. There are many attraction places in our country. For example: Bolshoy Theatre, Ermitag, Petergof. 2. I know high mountains, there are Uralskye Mountains 3. There are many big lajes in Russia, but Baykal is the biggest lake in our country 4. Our winter is very could, but sometime winter can by warm 5. Summer in Russia is change. Summer can be warm, or cold