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23 Find all the infinitives in the following sentences:

1 If a person is said to suffer from hypertension, the ex­pression means that the average arterial pressure of that person is above the level which is accepted as normal. 2 Sometimes, an underlying disease or other condition is found to be the cause of high blood pressure. 3 Researchers do know that essential hypertension tends to cluster in families, so heredity is thought to play a strong role. 4 On the whole, patients whose tumors were found during a physical examination were three times as likely to be treated with chemotherapy than those who had tumors detected by mammography. 5 Children with asthma who live with one smoker may be more than twice as likely to miss school because of a respiratory illness than are unexposed children. 6 If children with asthma live with two or more smokers, they may be more than four times as likely to be absent with respiratory illness. 7 Even children without asthma may be 40 percent more likely to miss school with a respiratory ailment if they live with at least two smokers. 8 While some foods appear to reduce the risk of prostate cancer, others seem to have the opposite effect. 9 Some of the effects of smoking on the digestive system appear to be of short duration. 10 Most adults who started smoking in their teens never expected to become addicted. 11 Oxidative stress, an imbalance in the pro-oxidant/anti-oxidant status of a cell, appears to cause or participate in the development of certain diseases, notably cancer.

24 Open the brackets. Give the required form of the infinitive:

1 Evidence of a link between passive smoking and heart disease began (to establish) in the mid 1980's. 2 Since then, studies have shown conclusively that not only does exposure to ETS increase the risk of heart disease in non-smokers but that the risk might (to be) irreversible. 3 It would (to appear) that even a small exposure to tobacco has a large effect on heart disease. 4 Exposure to toxic compounds in infancy is particularly problematic because early lung development appears (to be) a critical determinant of respiratory health. 5 Childhood exposure to ETS seems (to be) a risk factor for the development of asthma. 6 The effects of maternal smoking during pregnancy appear (to be) dose-related. 7 Some compounds found in tobacco smoke, such as nicotine, carbon monoxide, and polycyclic hydrocarbons are known (to cross) the placenta. 8 Some changes may (to interfere) with placental blood flow. 9 The combination of intrauterine hypoxia and impaired placental blood flow is believed (to slow) fetal growth. 10 Tobacco use is most likely (to be) initiated in adolescence, a stage of life characterized by significant physiological, psychological, and social changes. 11 Girls may also (to believe) that smoking helps them control their weight. 12 A young person who uses tobacco daily is likely (to be come) addicted to nicotine.

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