Find the missing number in the series below

13 -21 34 -55 ? -144

What runs around the whole yard without moving?

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?

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

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

What word is pronounced the same if you take away four of its five letters?

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

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

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?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?