A man was driving a black truck riddle

Question: A man was driving a black car. His lights were off. The moon shown no light. A cat was in the middle of the road. How did he know to stop?

Question: What do you get when you cross a witch with sand?

Question: What do you call a sad bird?

Question: What kinds of balls do dragons play soccer with?

Question: What can be broken but never forgotten?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?