Short Riddles and Answers

Question: Martha Speaks walked up to a fox and said, "what does the fox say?" What did the fox say?

Question: When you talk about it, it disappears. What is it? A. A secret B. Silence C. Time

Question: How can you throw a ball 20 meters, and have it come back to you without hitting anything?

Question: We have what we did not find; what we did find we left behind.

[What do we have?]

Question: I am an instrument that you can hear, but you can not touch or see me.

What am I?