1) Do you like frog's legs?
______ them, I really don't know
a) Never trying
b) Not to have tried
c) Never having tried
d) Never had tried
2)If you pay for the movie, I'll _____ for dinner.
3) The teacher told Sue her comments were interesting but not________.
c) relevant <collocation: interesting but not relevant>
4) The boy didn't fall even though he was ___ on the edge of the cliff
a) peering peering over
5) [For scholars] To reject folk tales as historical evidence because they cannot be dated and situated with precision like other historical documents is to turn one back's on one of the few points of entry into the previous century.
The infinitive phrase is nominal and functions as the subject of the verb 'is'.
The part in bold means that scholars shouldn't reject (i.e., turn their backs' on) folk tales because even though these stories can't be verified, they nevertheless hold some truth about the way people lived and thought during those times.
Student or Learner