Meaning of ‘opposite’

What does it mean by ‘Look at these sentences with expressions from A and B opposite.’? This sentence is the instruction words of an exercise in an English exercise book.

I don’t understand the word ‘opposite’ here.

You should mention the source. From this and some of your other questions, I'm guessing this is probably from Bill Mascull's Business Vocabulary In Use (Cambridge University Press). In the paper (printed) editions, these books are laid out so that exercises use two opposite pages. The even numbered pages (on the left) show example phrases, pictures, etc. The odd numbered pages (on the right) have questions for you to answer, which refer back to the material 'opposite'. These books are available online or in PDF form where the pages may not be shown in left- and right-hand pairs. On the question pages, 'opposite' means 'on the other page, to the left, that you can see'. Look on the previously numbered page, e.g. if the question is on page 48, look at the sentences on page 47