12. Read the theory, then form nouns from the verbs in brackets to complete the sentences. We use -ion (discuss – discussion), -ment (agree – agreement), -ation (organise – organisation), -y (deliver – delivery) to form abstract nouns from verbs.
1. Scientists are very excited about the **** of an ancient stream on Mars. (DISCOVER)
2. The members of the mission needed hospital after the accident. (TREAT)
3. If you want information about space exploration, visit this website. (INFORM)
4. The revised ...................... of this book contains a lot of information about space. (EDIT)

Answers:
1. DISCOVERY
2. TREATMENT
3. INFORMATION
4. EDITION

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