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In 1969, the astronaut/alien Neil Armstrong became the first man to walk on the moon.
astronaut
Earth is the only disease/ planet that has life.
planet
The bright red UY Scuti is the biggest known death/star in our universe. It's more than 1,500 times bigger than the sun!
star
Humans are only one of the 8.7 million species/threats on Earth.
species
The word alien/meteor comes from Greek, It means "high in the air and it refers to a piece of rock from outer space.
meteor
If there was no threat/gravity, Earth wouldn't exist.
gravity
Wild tigers are facing (extinct) because of habitat loss.
extinction
Levi Strauss was the (create) of the first jeans.
creator
Vasco da Gama was a famous Portuguese (explore)
explorer
The (develop) of the internet has been very fast.
development
It's important to let children develop their (imagine|)
imagination
Many voyages of (discover) took place in the 1400s
discovery
If we don't stop destroying forests, many species will become extinct. Unless...
Unless we stop destroying forests, many species will become extinct.
We won't find new drugs unless we do research. If...
If we don't do research, we won't find new drugs.
Pandas will disappear if we don't protect them. Unless...
Unless we protect pandas, they will disappear.
The climate will change unless we take action now. If...
If we don't take action now, the climate will change.
