FCE Use of English Part 2, Old Faithful

Answers and explanations

9. at. When something happens at some interval, it does so regularly with some time in between. ‘Uneven intervals’ here mean that this time is not the same.
10. long. ‘As long as’ shows how much an eruption can last here – ‘five minutes’ at the end of the sentence helps us make the right choice.
11. of. ‘Practice of doing something’. We choose ‘of’ because of the gerund ‘doing’. ‘Practice to do’ is also possible, but not with a gerund form.
12. between. The idea is to show that two things are connected – a connection between them.
13. last/are. Note that ‘take’ should not be used as an answer – it would mean that we are looking for some result of this action. For example, ‘it takes about 10 minutes to boil an egg’.
14. globe/world/planet. We make a contrast between local visitors from the US and those that come from elsewhere.
15. seeing/visiting. ‘To plan on doing something’ – another case where verb form required is a gerund. ‘To plan to do something’ is another way to show a similar idea, but we are limited by the preposition ‘on’ in the text.
16. while. ‘At the same time’ or ‘in additions’ is the idea conveyed by the phrase.