Scientists are trying to find ______ where humans can live in the future.

Jane loves __________ new places and learn about different cultures.

The famous _____ has traveled to the North Pole many times.

There is always some ______ involved when flying into space.

When the spaceship gets into the space, the scientists push the button to _____ it from the rockets.

Before the launch, the engineers had to ______ all necessary equipment to the spaceship.

Some people believe that aliens have visited Earth using an ______.

That author has a great ability to _______ life beyond our solar system.

Children sometimes have (a/ an) _____ friend when they are young.

The police officer asked for my __________ before letting me enter the building.

The pilot prepared to __________ the plane at the airport.

The general planned to __________ the enemy’s base by nightfall.

(general: Vị tướng)

The object seen in the sky was classified as a __________ flying object.

(classified: Được phân loại)

Some people believe that __________ exist somewhere in the universe.

(exist: Tồn tại)

Astronomers are searching for __________ where life could exist.

The astronauts had to ______ the spacecraft on the surface of the moon carefully.

The scientist was excited to study the _____ bacteria found on Mars.