Вставить артикли 1. room 40 is on fourth floor. 2. room 53 on fifth floor? 3. lesson 20 is easy, lesson 21 is difficult. 3. lesson 19 more difficult than lesson 15. 5 . lesson 3 most difficult lesson in book . 6.

1. ... Room 40 is on the Fourth floor.
2. Is Room 53 on ...the Fifth floor?
3. Lesson 20 is easy, Lesson 21 is difficult.
4. Lesson 19 is more difficult than Lesson 15.
5 . Lesson 3 is ..the. most difficult lesson in the book.