поставьте предлог где необходимо
1)what do you think _ Great Britain?
2) countries _ the world are different _ their size
3) America consists _ north America and South America
4) I started school _ the age of seven
5) the computer classes are located _ the finest floor

1)what do you think of/about Great Britain? 2) countries of the world are different in their size 3) America consists in  north America and South America 4) I started school in/at the age of seven 5) the computer classes are located at the finest floor