1. First, read the meaning in the riddle and understand the hints given. Waiting for good news can be understood as waiting for good news, while slow cooling can be understood as low tide or cooling temperature.

2. Secondly, analyze the key words in the tips. The "good news" and "sound" in waiting for good news can be interpreted as "music" or "good news", and the "slow" and "cooling" in slow cooling can be interpreted as "slow decline".

3. Finally, choose appropriate words to fill in the blanks of the riddle. According to the key words, the answers are: "Qu" (music), "Steady" (slow) and "Gradual" (gradual decline).