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 from 39 to 43

WHY DO ANIMALS GO EXTINCT?

Different kinds of animals have appeared and disappeared throughout Earth’s history. Some animals go extinct because the climate (39) ______ they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die. Some animals go extinct because they cannot (40) ______ with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (41) ______ from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a different kind of animal evolves. Sometimes many of the animals on Earth go extinct at the (42) ______ time. Scientists call this a mass extinction. Scientists think there (43) ______ at least five mass extinctions in Earth’s history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.

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 following questions.

Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful. In fact, there are about four thousand books with titles that begin with the words “How to”. One book may tell you how to earn more money. Another may tell you how to save or spend it and another may explain how to give your money away.

Many How-to books give advice on  careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all, you may need a book called “How to Live on Nothing”.

One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love every Minute of Your Life”. If you are tired of books on happiness, you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house.

Why have How-to books become so popular? Probably because life has become so complex. Today people have far more free time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life.

What is the passage mainly about?