Choose the topic sentence for each paragraph. (write down the number) 1In a student cafeteria, the students serve themselves. 2When they have finished, they take their dirty dishes back to a special table. 3in this way the cost of employing cafeteria staff is reduced because there is no need for waiter. 4The same number of students eat in the cafeteria each day. 5As a result, the managercan calculate the exact amount of food to buy, and very little is wasted. 6Finally, the cafeteria makes no profit, which reduces the cost of meals by at least ten per cent. 7On account of these factors, the Student Union Cafeteria should be able to provide meals at a lower cost than restaurants in town.