What is tasty is not always healthy. Doctors say that chips and pizzas are fattening, fizzy soft drinks damage our teeth, and coffee shortens our lives. If we eat (21) ______ much, we’ll become obese, and obesity leads to heart disease, diabetes, and other serious illnesses. Lack of exercise is another serious problem. We spend hours in front of our computers and TV sets. Few of us do morning exercises. We walk (22) ______ because we prefer to use cars or public transport. Research shows, however, that young people who don’t do enough exercise often suffer from heart attacks later in life. It’s common knowledge that smoking and drinking can shorten our lives (23) ______. Cigarette smoking, for example, kills millions of people every year. Many of them die (24) ______ lung cancer. Yet many young people still smoke and drink. Why? One answer is that tobacco and drinks companies invest enormous sums of money in advertising their products. For them, cigarettes and alcoholic drinks mean money. For us, they mean disease and even death. We all know that the healthier we are, the better we feel. The better we feel, the longer we live. So why not (25) ______ ourselves? 21 a also b very c too d so 22 a littel b least c less d more 23 a absolutely b intensively c dramatically d extremely 24 a from b about c with d in