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57 8. The method a person chooses for committing/to commit a suicide is often determined by cultural factors. 9. However, using/to use a method that proves not to be fatal, does not indicate that person’s intention was less serious. 10. To drink/Drinking alcohol can contribute to obesity. III. Complete the sentences using the correct form of the gerund or the infinitive of the verbs in brackets. 1. (To sleepwalk) is rising from bed and walking around while a person is sleeping. 2. Doctors may be able (to prevent) many problems (to monitor) the fetal growth and development using ultrasound. 3. (To help) people evaluate the risk of vaccination, the federal government requires doctors (to give) parents Vaccine Information Form each time a child is vaccinated. 4. (To confirm) the diagnosis of psoriasis, a doctor may (to perform) a skin biopsy. 5. Staphylococci have the tendency (to infect) the skin. 6. (To listen) to the heart is a necessary procedure in (to examine) a patient in many clinical conditions. 7. The third way of (to classify) bacteria is by their use of oxygen. 8. Interferon alfa is effective in (to treat) certain cancers, such as hairy cell leukemia. 9. When immune system starts (to develop) in the fetus, stem cells migrate to the thymus. 10. Shortness of breath is unpleasant sensation of difficulty in (to breathe). IV. If the sentence is correct put the letter R (right), if incorrect put W (wrong) and give the right answer. 1. The telephone number of drug poison control centers should be copied and placed near you radiophones or programmed into an automatic dialing mobile phone. ____ 2. Diuretic is a drug that increases the volume of urine produced by promoting extraction of salts and water from kidneys._______ 3. Contraindication is a condition or a symptom indicating that a certain advisable drug or procedure should not be used in this situation or by this patient. ________ 4. To reading in bed is harmful to your eyes. ______