I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What is the longest word in the dictionary?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What number should come in place of the question mark below?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Prove that twice of ten is the same as twice of eleven.

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

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

By using 'because' continuously three times, can you make an English statement ?