They use satellites to study volcanoes (19) _______ space.

Choose the best answer A, B, C or D to complete each of the following sentences.

 It is __________ easier to prevent harm to the environment than to repair it.

Choose the best answer A, B, C or D to complete each of the following sentences.

I had no idea about the dangers of tsunamis __________ I saw the film.

Some volcanoes are always (16) ______

Rewrite second sentences with the same meaning.

We saw an accident on the way home.

While we were ____________________________________________________________.

Rewrite second sentences with the same meaning.

 Because it rained heavily, we canceled the match.

It rained __________________________________________________________________.

 Choose the best answer A, B, C or D to complete each of the following sentences.

We watched a __________ broadcast of the president’s speech.

Choose the best answer A, B, C or D to complete each of the following sentences.

 I think we will find another habitable planet __________ 15 years.