Вставьте a или the Tom is ... good boy. This is ... exercise book. ... exercise-book is on...the table. It is ... pen . ... pen is red.
Tom is а good boy. This is an exercise book. The exercise-book is on the table. It isa pen . The pen is red.
Tom is a good boy. This is an exercise book. the exercise-book is on the table. It is a pen . the pen is red.