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.

Some volcanoes are always (16) ______

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.

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

Find the mistake in each of the following sentences and circle A, B or C.

This house were bought 2 years ago.

Rewrite second sentences with the same meaning.

We saw an accident on the way home.

While we were ____________________________________________________________.

Choose the word marked A, B, C or D that has a different stress pattern from the others.