Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

Set in the red desert of central Australia is the mining town of Coober Pedy. At first sight, the town looks similar to many other such communities, but Coober Pedy is different. Sixty per cent of its population of 4,000 people lives underground. There are today about 800 underground houses as well as shops, hotels and even churches in the town and the surrounding hills. Once a site has been chosen, special tunneling machines are (30) _______ in to create passages and rooms in the sandstone. Rock pillars are left to support the roof, and doors and windows are cut into the front. Houses are of all shapes and (31) ________, the largest having twenty rooms, and some even have their own swimming poll.

Living underground may sound strange but in fact it has a number of advantages. In summer, the temperature outside can reach an astonishing 47°C, and in winter the nights can be (32) _______ cold. However, inside the houses it remains a steady 25°C all year round. Many people say that living underground makes they feel very secure. There is no problem with noise from the neighbours and the houses are not affected. By the fierce dust storms that regularly sweep (33) _________ the area. And of course, if your family (34) ____________ or lots of friends come to stay, you can always dig another room.