Read the theory box. Fill in: a or an 1............. Atlas 2.............notebook 3.............folder 4..............briefcase 5..............eraser 6...............book 7...............schoolbag 8...............ruler 9..............pencil case

1 an
2 a
3 a
4 a
5 an
6 a 
7 a
8 a
9 a