You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

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

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:

Which is faster, Heat or Cold ? Explain.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A father's child, a mother's child, yet no one's son.

Who am I?

What is always in front of you but can’t be seen?

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?