Read the passage about unusual jobs and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

Unusual Jobs

Around the world, there are some jobs that may seem quite strange and surprising to you.
[I] In Japan, the railway system is huge and everyone there uses trains. [II] This makes them overcrowded most of the time. [III] During rush hour, railway station attendants called pushers or oshiya perform a unique task - they push passengers into trains. [IV] This is necessary because of the large number of commuters who wish to arrive at their destinations on time.
Have you ever wondered how the world's tallest building, Burj Khalifa in Dubai, is cleaned? It takes a team of 36 window cleaners a total of three months to clean the tower's reflective windows. Working from a height of more than 800 meters, the cleaners face huge challenges, especially during bad weather. They must be the bravest cleaners in the world.
In the UK, millions of golf balls are lost every year in the lakes and ponds around golf courses. This has led to a demand for golf ball divers, who retrieve and clean the balls. Most divers are professionals, but they spend long hours crawling through mud and carrying heavy buckets. On average, they collect about 5,000 balls per lake, which are later resold or recycled.