Minecraft is a block related game. The developers never intended for their to be circles in minecraft.
Yes, see the related link below for Minecraft's official site.
Minecraft's Item ID's can be found on Minecraft Wiki. Link in related links.
Minecraft seeds can be found on the Minecraft forum. See the related link below.
Mods can be downloaded from Minecraft Forums. (See related link below.)
Download it at the official minecraft website. The link can be found in related links.
you can't, maybe there is a mod for or something but in default minecraft there are no computers...
Minecraft's home page. The link is under "Sources and related links" below this answer.
You can get Minecraft from the official site for $26.95 US Dollars. In the related links below is their official site.
A Minecraft server adress is the location on the internet in which the Minecraft server is stored on. Minecraft server addresses are often a set of four numbers, such as 000.000.000.000(:25565). If the owner of a large Minecraft server has a website, it is not uncommon for the address to be something like this: "hub.worldofkeralis.net".
Destroy it!
Placing items in Minecraft is usually done with the right mouse button.