Good Riddles

 
sky (easy)

Question: what is in the middle of the sky?

Mass (easy)

Question: What can float but can't sink.

😪 (easy)

Question: What can you smell but not see. And can be deadly, too.

By jBoner

Question: What word is shorter when you add two letters to it?

Riddle #4 (medium)

Question: What starts with the letter "t", is filled with "t" and ends in "t"?