Riddle 1: The answer is "Countdown".

Riddle 2: The answer is "Red couplets".

Riddle 3: The answer is "Fireworks".

Riddle 4: The answer is "Fullmoon".

Riddle 5: The answer is "Snake" and "Zodiac animal".

Riddle 6: The answer is "The 12 zodiac signs".