What goes up but never comes down?

Which is the smallest number that you can write using all the vowels exactly once?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

What is the word or phrase below?
R | E | A | D

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I cannot talk, but I always reply when spoken to. What am I?