Possible Clues:

• They're not 15 down
• After a double century I makes a hole in them, but not on purpose
• They happen on the race track
• It's nice about five hundred in the unforeseen doings
• How I'd get into a way of speaking, but not on purpose
• How a double century is about to make a hole in them by mistake
• What is M is taken to lead to such smashing things
• That could be a small measure I makes a hole in, but not on purpose
• That's a double century I makes a hole in by mistake
• I'd get into ways of speaking, but never on purpose