Good Riddles

Question: I guide you but you can't hear me. Without me you would be lost. I keep going and won't be stopped. What am I?

Question: What is red and white at home, but can never be that when it leaves?

Question: Mom and Dad had four girls. Each girl had one brother. How many people are in the family?

Question: how do cows count?

Question: Which thing that comes once in a year, twice in a week?