A __________ is a person.
Human
A lion can be a __________ animal.
Dangerous
The __________ is 30 degrees, so it's hot today.
Temperature
Cars are made in big __________.
Factories
This puzzle is very __________ and hard to solve.
Difficult
The subway train travels __________ the city.
Underground
I use a __________ on my computer to write.
Program
A __________ on the door can tell when someone is there.
Sensor
I want to fly to __________ and see the stars.
Space
Computers and phones are types of __________.
Machines
We use a special __________ to cook with.
Gas