OXFORD WORD UNIT 6-11

A _______ is used to orbit the Earth for communication purposes.

• planet

• star

• satellite

• moon

The Earth _______ the Sun in a circular path.

• circles

• spins

• floats

• descends

The Moon _______ around the Earth every 27.3 days.

• orbits

• revolves

• rotates

• swings

There are _______ 8.7 million species of organisms on Earth.

• exactly

• roughly

• precisely

• entirely

The scientist calculated the speed as _______ 300,000 km/s.

• roughly

• approximately

• vaguely

• precisely

The idea that humans could live on Mars seems _______ at the moment.

• realistic

• far-fetched

• practical

• obvious

He managed to _______ a lot of knowledge by reading scientific journals.

• lose

• gain

• reject

• ignore

Our _______ consists of the Sun and all the celestial bodies that orbit it.

• galaxy

• universe

• solar system

• constellation

The research was conducted using _______ methods.

• artistic

• scientific

• historical

• fictional

Astronauts _______ the surface of Mars for signs of life.

• ignored

• explored

• polluted

• cleaned