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:

Unfortunately, diets don’t work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key (1) ______ maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (2) ______. The next step is to add exercise (3) ______ you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big (4) ______. You can ride an exercise bike while you are watching television (5) ______ you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there is someone to talk to. It's a good idea to wear firm-fitting clothes if you are on a diet. Tight clothing acts as a reminder of what you are trying to accomplish.

Building a sensible diet and exercise plan is the key (1) ______ maintaining a consistent weight.