Which number should replace the question mark?

You see me once in June, twice in November, and not at all in May. What am I?

Be active and find the killer in the picture Riddle below.

Can you find out the number of the parking space in which the car is parked?

What has many keys but can’t open a single lock?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

Which tank will fill first?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Take one out and scratch my head, I am now black but once was red. What am I?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?