This is ___ mode.
survival
All living things cannot __ without water.
survive
This is a ___ street.
cobblestone
The __ inside an egg takes 21 days.
development
The tricycle has 3 __
wheels
I think we should give back all birds their ___
freedom.
The world in Mini World game is not real, it's a ___ one.
virtual
This is a ___ tyre, not a solid one.
pneumatic
To finish a work well, we have to ___ to it.
contribute
This is a solid ___, not a pneumatic one.
tyre
These things are made of __
metal