Good Riddles

Question: Timmy's mother has three children. The first was named April. The next was named May.

What is the final one's name?

Question: My first two are male, and my first three female.
My first four save them both, and my whole is a female of the same sort.

What am I?

Question: No matter how much rain comes down on it it won't get any wetter.

What is it?

Question: Wednesday, Tom and Joe went to a restaurant and ate dinner. When they were done they paid for the food and left. But Tom and Joe didn't pay for the food.

Who did?

Question: It's got twists and turns, but has no curves.
Twist it to fix it, turn it to ruin it.

What is it?