

Это моя книга.
This is my book.
Где твоя книга?
Where is your book?
Эта книга очень интересная.
This book is very interesting.
"книга" is in the lesson "Classroom" (Level 9), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.