To use a clock in minecraft, just simply look at it. It tells you the time, as if the sun is up then the sun will be up in your world and in that position.
Yes you can grow cactus in mine craft Pocket edition ,cuz I have a cactus farm
No.
yes
You dig .
cant you ...............
no
With an iron pickaxe
Tap it
you tap on it
No
theederscrolls
find it and mine it with iron pickaxe or better