A proverb says that which seldom knocks twice?

What word describes a proud, stiff, pompous walk? What English proverb is the Spanish "No hay tiempo como el presente"? What English proverb is the Spanish "Pensar antes de hablar"? A proverb says "Make yourself all ___ and the flies will devour you." What word? Which energy services company has traded on the stock exchange as HAL? In Spanish, "venado" is the meat of which animal? What does HMO stand for? Which company, which provided Internet service to millions, was known by the initials AOL?