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Because the supply of natural gas was plentiful in comparison with other choices like coal and fuel oil, and because it burns cleaner, many people changed their heating system to natural gas, therefore creating shortage.Why did people prefer gas? Because .

A. it was natural
B. there were no other choices
C. the other fuels were dirtier and less plentiful
D. there is, even today, a plentiful supply of it

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Perhaps no country is so many-sided asSwitzerlandis today. Situated in the very heart of Europe, Switzerland has long been famous for its ideal tourist center on account of her majestic, varied scenery, her unique position of possessing no less than four national languages and a reputation for generous hospitality and warm humanity.A lot of people visitSwitzerlandbecause .

A. it is situated in the very heart of Europe
B. it is a wonderful country in every side
C. they can study four languages there
D. there are many well-known hospitals there

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What is the most obvious in this book are all those details of daily living which makes Mrs. Richards anything but common.According to this statement, what kind of person is Mrs. Richards?

A. She is very obvious.
B. She is anything she wants to be.
C. She is an unusual person.
D. She is quite ordinary.

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Even though Julie is a champion swimmer, she still practices every day.

A. Julie practices swimming every day, despite the fact that she is a champion swimmer.
B. Even though Julie practices every day, she is still a champion swimmer.
C. If Julie practices every day, she will be a champion swimmer.
D. Julie practices swimming every day, consequently she is a champion swimmer.

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A vaporizer cannot cure a cold, but it can make you feel better.

A vaporizer is a cold medicine, which helps you feel better as it works.
B. Though it can make you feel better, a vaporizer cannot cure a cold.
C. A vaporizer can cure a cold.
D. Curing a cold is the way a vaporizer can make you feel better.

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Because the supply of natural gas was plentiful in comparison with other choices like coal and fuel oil, and because it burns cleaner, many people changed their heating system to natural gas, therefore creating shortage.Why did people prefer gas? Because .

A. it was natural B. there were no other choices C. the other fuels were dirtier and less plentiful D. there is, even today, a plentiful supply of it

What is the most obvious in this book are all those details of daily living which makes Mrs. Richards anything but common.According to this statement, what kind of person is Mrs. Richards?

Even though Julie is a champion swimmer, she still practices every day.

A vaporizer cannot cure a cold, but it can make you feel better.

A. it was natural
B. there were no other choices
C. the other fuels were dirtier and less plentiful
D. there is, even today, a plentiful supply of it