Which is the right answer

1..A.Tomorrow is my birthday. It's my twelfth bithday.  BTomorrow is my birthday. It's my  the twelfth bithday.

2.. A.Be careful. You ride your bicycle too quick.   B.Be careful. You ride your bicycle too quickly.

3. A.Who has some cakes?   I have.    B. Who have some cakes? I have.