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

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

How can you tell a raw egg from a hard-boiled egg?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

The Little ant seems to be always confused. Do you know why?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What have one eye but still cannot see?