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.

WHAT IS SPEED READING, AND WHY DO WE NEED IT?
Speed reading is not just about reading first. It is also about how much information you can remember when you have finished reading. The World Championship Speed-Reading Competition says that its top competitors average between 1.000 and 2,000 words a minute. But they must remember at least 50 percent of this in order to qualify for the competition. Nowadays, speed reading has become an essential skill in any environment ___(1)___ people have to master a large volume of information.
Professional workers need reading skills to help them ___(2)___ many documents every day, while students under pressure to deal with assignment may feel they have to read more and read faster all the time.
___(3)___ there are various methods to increase reading speed, the trick is deciding what information you want first. For example, if you only want a ___(4)___ outline of an issue, then you can skim the material quickly and extract the key facts. However, if you need to understand every detail in a document, then you must read it slowly enough to understand this. Even when you know how to ignore irrelevant detail, there are ___(5)___ improvements you can make to your reading style which will increase your speed.
(Adapted from Complete IELTS student's book by Guy Brook-Hart and Vanessa Jakeman)