THE ALPHABET GAME (F)

Happy Thursday, everyone! How's your week going? 

Today we are continuing with the 2021 Alphabet Game. Remember, if you participate, you can win some nice prizes.

1st Prize: A six-month General-English online course valued at 230.00€. It includes the initial level test, guidance with an online tutor, telephone contacts and written tutorials.
2nd Prize: a three-month 'English-for-Work' online course valued at 120.00€. It includes the initial level test, guidance with an online tutor, telephone contacts and written tutorials. The winner can choose the type of course they prefer (English for Meetings; Making Presentations; Negotiating and Selling; Banking and Finance; Telephoning; Dealing with the Public; Writing; Applying for a Job; or Travelling).
3rd Prize: a Tronsmart T6 Mini portable Bluetooth Speaker, valued at 30.00€.

Here is today's sentence. It's actually missing TWO words today! Both words begin with the letter F.

Sentence: We now rely more on solar energy and less on f_____ f_____. 

Hint 1: It means "A source of energy (like coal or gas) that was made from the remains of living organisms."

Hint 2: The first word is also often used to talk about dinosaur bones. 

Keep your eye on the prize and give us your answer on one of our social media sites (Facebook or Twitter) and we will provide the correct answer later. We will also include the answer in the next Daily Vitamin email. 

Good luck!