1. available            a) able to be used

2. to deliver           b) to take (goods, letters, etc.) to people’s 

houses or places of work

3. efficient              c) opposite to ‘reliable’

4. inefficient           d) working or operating quickly and 

effectively in an organized way

5. reliable               e) something that is reliable can be trusted 

because it works well

6. lingua franca     f) a language which is used for 

communication between groups of people who speak 

different languages 

7. unreliable           g) opposite to ‘efficient’