I have branches, but no fruit, trunk or leaves. What am I?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

How can a man go eight days without sleep?

Which is heavier: a ton of bricks or a ton of feathers?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?