Clean riddles for teens

If 20 blackbirds are on a fence and you shoot one, how many remain?

What is unusual about the following words: revive, banana, grammar, voodoo, assess, potato, dresser, uneven?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

You leave home, make three left turns, and return home where you find two men wearing masks. Who are they?

I create my lair with earthen string and dispatch my prey with a biting sting. What am I?

Two workmen were repairing a roof. Suddenly, they both fell down the chimney and found themselves in the large fireplace. One man`s face was smeared with soot and one wasn`t. The one with the clean face washed his and the dirty man did not and went back to work. Why?

What did the store clerk say to the woman who asked to try on the dress in the window?

It is an insect, and the first part of its name is the name of another insect. What is it?

Name the only sport in which the ball is always in possession of the team on defense, and the offensive team can score without touching the ball?

A man has two ropes of varying thickness (Those two ropes are not identical, they aren’t the same density nor the same length nor the same width). Each rope burns in 60 minutes. He actually wants to measure 45 mins. How can he measure 45 mins using only these two ropes. He can’t cut the one rope in half because the ropes are non-homogeneous and he can’t be sure how long it will burn.