They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

what's the probability of getting a king or a queen from a pack of 52 cards?

I am an odd number. Take away a letter and I become even. What number am I?

What demands an answer, but asks no questions

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

John was piloting a plane behind a car but was never able to overtake it. Why?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Solve the following series:
AZ, GT, MN, __, YB