Mark the letter A, B, C or D to indicate the correct response to each of the following exchanges

Mr. West Hello. Can I help you? - Emma                   

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks.

Today our (23) __________ of food and what it does for our bodies is far more advanced than that of the ancient. Now we know (24) __________ vitamins and how each kind of vitamins helps in the growth of a particular part of our bodies. There are on the market all kinds of vitamin pills one can take to make up for one's lack of certain important things (25) __________  are needed for normal health. Of course, if we eat well and properly, the food that we eat will take care of our bodies without these pills. Just take vitamin pills if our doctor tells us that our bodies are short of something that (26) __________ by them. Generally speaking, everything that we eat does some good to our bodies, but if we eat too much of one kind of food and pay no (27) __________  to others, we may have too much of one kind of chemical substance and not enough of others. Then, we may be in trouble. Therefore the best advice about what to eat is that we should eat all kinds of food but never too much.

According to the passage, all of the following contributed to the spread of English around the world except.

He started learning French six years ago.

Last week, we spent an                    day at my uncle's farm.

Mark the letter A, B, C or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions.

Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy.

Currently, about 80 percent of the information stored on computer systems worldwide is English. Two - thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers - Today there are more than 700 million English users in the world, and over half of these are nonnative speakers, constituting the largest number of nonnative users than any other language in the world.

What is the main topic of this passage?