1. Floor
- ground
- land
- earth
These are all words for the surface that you walk on.
floor the surface of a room that you walk on:
EX:
She was sitting on the floor watching TV.
ground (often the ground) the solid surface of the earth that you walk on:
EX:
I found her lying on the ground.
The rocket crashed a few seconds after it left the ground.
land the surface of the earth that is not sea:
EX:
It was good to be back on dry land again.
They fought both at sea and on land.
earth (often the earth) the solid surface of the world that is made of rock, soil, sand,
etc:
EX:
You could feel the earth shake as the truck came closer.
ground, land or earth? Ground is the normal word for the solid surface that you
walk on when you are not in a building or vehicle. You can use earth if you want to
draw attention to the rock, soil etc. that the ground is made of. Land is only used
when you want to contrast it with the sea: the land beneath our feet • feel the land
shake.
PATTERN
on/​under the floor/​ground/​earth
bare floor/​ground/​earth
to drop/​fall to the floor/​the ground/(the) earth
to reach the floor/​the ground/​land
2. Option
- choice
- alternative
- possibility

These are all words for something that you choose to do in a particular situation.
- option something that you can choose to have or do; the freedom to choose
what you do:
EX:
As I see it, we have two options…
Students have the option of studying abroad in their second year.
- Option is also the word used in computing for one of the choices you can
make when using a computer program:
choice the freedom to choose what you do; something that you can choose to have
or do:
EX:
If I had the choice, I would stop working tomorrow.
There is a wide range of choices open to you.
- alternative something that you can choose to have or do out of two or more
possibilities:
EX:
You can be paid in cash weekly or by cheque monthly: those are the two
alternatives.