Alexander Graham Bell (亚历山大·格雷厄姆·贝尔) ________ the telephone.
practiced
invented
You have to ________ to be good at dancing.
invent
practice
A _________ protects their country.
policeman
soldier
The umbrella _________ from the rain.
fight
protects
These are __________.
weapon
guns
They are __________.
fighting
practicing
A group of soldiers is called an _________.
army
weapon
gun