If you're practising with the Cambridge IELTS books, you'll find audioscripts (written versions) of the recordings at the back of the books. I recommend that you read and analyse these in order to gain a better understanding of what the speakers said.
Let's look at two example questions from Cambridge IELTS 12:
21. What will be the main topic of Trudie and Stewart's paper?
A) how public library services are organised in different countries
B) how changes in society are reflected in public libraries
C) how the funding of public libraries has changed
22. They agree that one disadvantage of free digitalised books is that
A) they may take a long time to read
B) they can be difficult to read
C) they are generally old
Here's the part of the audioscript that contains the answers:
(Trudie) Maybe we should concentrate on this country, and try to relate the changes in libraries to external developments, like the fact that more people can read than a century ago..... We're only supposed to write a short paper, so it's probably best if we don't go into funding in any detail.
(Stewart) But the digitalised books that are available online for free are mostly out of copyright, aren't they? And copyright in this country lasts for 70 years after the author dies. So you won't find the latest best-seller or up-to-date information..... (Trudie) That's an important point.
Task:
What are the correct answers to the two questions, and which 'keywords' gave you those answers?