1. подставьте, где необходимо, предлоги. to of (4) by with the oral cavity is a fearsome orifice demanding constant gratification and full 1) microorganisms, some 2) which are potentially harmful. the oral mucosa is highly resistant 3) its indigenous flora and has many defences including the comprehensive suppression 4) potential pathogens 5) microorganisms 6) low virulence. saliva also has its antibacterial effect. but any lowering 7) these defences potentiates oral infection.

The oral cavity is a fearsome orifice demanding constant gratification and full 1) of microorganisms, some 2) of which are potentially harmful. the oral mucosa is highly resistant 3) to its indigenous flora and has many defences including the comprehensive suppression 4) with potential pathogens 5) by  microorganisms 6) of low virulence. saliva also has its antibacterial effect. but any lowering 7) of these defences potentiates oral infection.

Soon the summer holidays will come! i won't have  to get up early in the morning and run to school. i will be able to stay in the bed till midday. if the weather will be fine my friends and i will go for a walk every day. it will be fun! then i will spend a month in the country where my grandfather and grandmother live. it will be great. i will drink milk and eat a lot of tasty food which my granny will prepare for me. i have many friends in this village because i go there every holidays. we will play football and tennis every day! there is a small river near the forest and we will swim when the weather will be fine.