Mark the letter A, B, C, or D on your answer sheet to indicate the word those underlined part differs from the other three in pronunciation in each of the following questions.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42

"I have not paid a single electricity bill since the year 1970," says Richard Perez with noticeable glee. He can afford to be smug. He live "off-grid” – unconnected to the power grid and the water, gas and sewerage supplies that most people in the world rely on. He generates his own electricity, sources his own water and deals with his own water disposal - and he prefers it that way. “They are times when the grid black out," he says, “I really like the security of having my own electricity company."

Perez is not alone. Once the preserve of mavericks hippies and survivalists, there are now approximately 200,000 off-grid households in the United States of America, a figure that Perez says has been increasing by a third every year for the past decade. For all of the people who live off-grid, self-sufficiency mean guilt free energy consumption and peace of mind. "It feels brilliant to make use of clean, free energy that is not from fossil fuels," says Suzanne Gallant, a writer who lives off-grid in a rural area in Wales. "And if something goes wrong, we can fix it ourselves." Now even urbanites are seeing the appeal of generating some if not all off their own power needs. So is energy freedom and eco-pipe-dream or the ultimate good life?

Well, there is only one way to find out: begin to explore the possibilities of solar, wind and hydropower. But unless you live on a sunny, south-facing hillside with access to a nearby river or stream, that might prove prohibitively expensive!

There is no doubt that being off-grid has its problems, and it is not always the cheapest way to get the energy you need. Even so, pioneers like Perez have proved that it can be done and without giving up a 21^st - century lifestyle: " I have got five personal computers, two laser scanners, two fridge-freezers, a microwave a convention oven, vacuum cleaners - you name it", says Perez. "There is an external beams antenna on the roof for the phone and a satellite for an Internet connection. I have got 70 kWh in batteries that could last me five days. I have too much electricity." Too much electricity and no more bills. That has got to be worth aiming for.

(Adapted from English Unlimited by Adrian Doff and Ben Goldestein)