The ______ dog could walk and bark just like a real one.

Raising baby pandas in a zoo is an incredible _____ because it is very hard to do.

I’ve been watching the sky for hours, but I haven’t seen the asteroid so ______.

Does life ______ on Mars?

Because she had some trouble with her computer, she had to reinstall all the ________.

Janet is great at maths and physics, so she’s studying _________ at university.

This website is currently under __________.

Don't make any quick ________ that might scare the dog.

Have you ever wondered about the _________ of the universe?

An exoplanet is...

Earth is the only inhabited planet in our _______ system.

If you don’t study harder, you’ll end _____ failing your exams.

The rules of this game are too ________ (= difficult, confusing, puzzling, etc.)! I can’t understand them.

In the picture I can see a little boy who is playing with a ________- controlled car.

Choose the correct spelling.

I think you have a good chance of getting the job, but don’t ______ your breath as there are so many candidates.

We looked at the comet _______ the telescope.

The Grand Canyon is one of the natural ________ of the world.

The balloon _________ in the air and then the wind blew it away.

Telescopes were _________ in the 17th century.

Before writing an essay, you'll have to _______ for some information on the Internet.

Laboratory tests ________ the presence of the virus.

We're going to Paris for the weekend to see the ________.

The nearest galaxy to ours is over two million ______ years away.

We need to look for alternative ________ of energy.