I got full marks on question 3. All you have to do is think of it like building blocks, think why did the writer put it like this and what's the effect of doing so.
Let me give you an example
Initially, at the beginning of the extract the writer focuses us on how the jungle was 'full of laughter' but then he almost contradicts this by saying it was 'full of spikes'. The writer deliberately launches the reader in the problem of the story. This creates an unsettling atmosphere and he may have done this to show the mental state of the character and how they are worried about living here..