1) i can't say i'm familiar the latest discoveries in this field. 2) i appreciate the help you have given me. 3) his poems are familiar many young people. 4) many of us are familiar his poems. 5) i know i can solve this mystery myself. 6) he demonstrated his familiarity a lot of subjects. 7) out the blue he began to speak. варианты ответа: in, out, of, with, to.
2. with
3. to
4. to
5. with
6. out
7. out