Grammar

Choose the correct relative pronoun to complete the sentence

1. Mr. Smith, ... is my friend, has worked in the National Reserve for five years.

2. The Askania Nova , ... I visited last year, is a great home for wildlife.

I finished reading an article about climate change ... was really interesting.

An environmental conference ... will take place in Berlin next Monday is rather important.

I finished reading the book about nature, ... was made into a film.

Pesticides are chemicals ... are used for killing insects.