Помогите пожалуйста.
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.