Fill in the blank with the correct form of verbs: In some countries the average weight of people is increasing and their levels of health and fitness are decreasing

Exercise : in the blank with the correct form of verbs IELTS Writing Task Two In some countries the average weight of people is increasing and their levels of health and fitness are decreasing. What do you think are the causes of these problems and what measures could be taken to solve them? The main cause of the health crisis currently affecting many individuals (1) . (be) over-consumption of poor quality sustenance. Convenience food and junk food, such as microwave dinners, chocolate bars, McDonald's and pizza, has become a ubiquitous part of modern life. Eating too much of these high-fat meals can (2) . (cause) many people to gain weight and this (3) . (have) knock-on effects on someone's general wellness. For example, the movie 'Super Size Me' demonstrates that a person who (4) . (eat) this kind of food all the time will not only get fat but also (5) . (suffer) from such ..... things as raised blood pressure and even fatty liver disease.