All over the world, people who ... the ability to see
lack
Another type of code, which is called...
Morse code
These languages are ... into families
grouped
These include ... with an arm or hand
beckoning
Gestures of anger or..., a sign of welcome
disapproval
... dots on a surface ... them to fell each letter.
Raised/Enable
Sign language is... to people who can't hear
invaluable
The message we communicate and the way we...
transmit
Nobody knows exactly how many ... there are
languages
There are many possible answers to this ...
question
When languages have a common ...
ancestor
There were no astronauts in ...
Ancient Greece
Unlike Braile and Morse code, sign language is a true...
language
