1 Match the questions to the answers. 1 What is the topic of Unit 16? 2 Which words on this page are difficult to spell? 3 What is the meaning of 'mistake'? 4 Can you translate 'guess' into Spanish, please? 5 Where do you find lots of articles? 6 When do you make a list? 7 Where do you look up words you don't know? 8 How many exercises are there on this page? a on a news website b in a dictionary c learning languages d something that is not correct e four f 'exercise' and 'vocabulary' g adivinar h before going shopping