For listening tasks, never look at the transcript answer first. Listen 3 times:

Buy it if:
You’re studying alone or want extra B2/matura practice with full answers to check yourself honestly.

Skip it if:
You won’t have the discipline to avoid peeking at answers before trying.

Where to find it:
Most Bulgarian bookstores (Ciela, Hermes, Booktrading) or online with the audio access.

If you need help with specific exercises from the book (without me reproducing the whole key), just paste one or two questions, and I’ll explain the answers in detail. Would that work for you?

Student book text (use the word “insisted”):
“She said she wouldn’t change her mind. She ______ changing her mind.”

Full answer from key: insisted on not
Explanation: The phrasal verb “insist on” requires a gerund (-ing form). Negative structure: insisted on not + gerund.

Do not look at the answer key until you have completed an entire unit or practice test under timed conditions (2 hours for a full mock).