Сделать по нужно.. ))exercise 1. use present simple - active or passive: 1. a provisional denture (to use ) for a short period of time for reasons of esthetics, function, or occlusial support. 2. most patients (not to prepare) to function without teeth, even for a short time. 3. the mouth (to contain) a number of different tissues, some of which, such as mucous membrane, connective tissue, blood vessels, nerves, muscle, and bone, (to find) throughout the body. 4. foods (to differ) in their ability to stimulate salivary flow which, in turn, can influence their intra-oral effect. 5. the properties of an organism responsible for its pathogenicity (to call) virulence factors.

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