Scientists and doctors say that about 55 million Americans are too fat. Why is this? One (28)______is the kind of food Americans eat. Many Americans like "fast foods". These foods (such as hamburgers and ice cream) often have fattening things in them. (29)______cause is the way Americans eat. They often eat little snacks between regular meals. These extra foods (30)______ extra fat on the body. A third cause is that they do not take enough exercise. Americans like driving everywhere instead of walking. They often have (31)______ to do a lot of the work for them. Some Americans are also too heavy (32)______health problems. But for most of those 55 million people, the problem is the American lifestyle. Question 28: A. way B. source C. cause D. ground Question 29: A. Other B. Another C. The other D. Others Question 30: A. add B. put C. include D. make Question 31: A. equipment B. machines C. vehicles D. tools Question 32: A. instead of B. in spite of C. according to D. because of