Вставьте где нужно "a" или "an"
...ruler
...eraser
...pencil case
...notebook
...atlas
...blackboard
...book
...school bag
...pen
...pencil
...notepad
...timetable

большое спасибо!

большое спасибо!

a ruleran eraser a pencil case a notebookan atlasa blackboarda booka school baga pena pencila notepada timetable