The color of a chameleon depends __ its mood and surroundings.
on
Did you know that people used __ believe the Earth was flat a long time ago?
to
Hummingbirds can take _____ and fly backward, unlike any other bird.
off
In Japan, there's a hotel entirely run by robots; if a robot makes a mistake, it has to apologise _____ its error.
for
Whether an egg will become a boy chicken or a girl chicken depends __ the temperature during incubation.
on
The success of a beehive ____ on the hard work of each individual bee.
depends
The growth of a sunflower depends __ the amount of sunlight it receives.
on
Ancient Egyptians _____ write with ink made from crushed bugs.
used to
Before alarm clocks, people used ___ wake up using something called a "knocker-up," who tapped on windows with long sticks.
to
The first computers used ___ be as big as a room!
to
The peregrine falcon is the fastest bird; it can _____ at speeds over 240 miles per hour.
take off
A rocket needs an incredible amount of force to take ___ and leave the Earth's atmosphere.
off
Did you know that bananas are berries, but strawberries aren't? Someone should apologise ___ that confusion!
for
When talking about ancient civilizations, Alex thought it would be interesting to bring __ the mystery of how the ancient Egyptians built the pyramids without modern tools.
up
When learning about the history of inventions, Ben wanted to bring __ the fascinating fact that the ancient Greeks had a primitive version of a robot called "automatons.
up
Wolves work together to bring ___ their young wolves, teaching them how to hunt and survive in the wild.
up
