Some questions need resolving

01) Do you like the frog's leg?02br
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01i00____02i00 them, I really don't know02br
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00a) Never trying02br
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00b) Not to have tried02br
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00c) Never having tried02br
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00d) Never had tried02br
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00--> I think a and c are both sensible. But is it possible to pick one out here? Any different ideas?02br
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002)If you pay for the movie, I'll 01i00___02i00 for dinner02br
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00a) snap02br
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00b) sprout02br
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00c) spark02br
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00d) spring02br
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00I'm in the dilema... My dictionary doesn't mention the four words as "paying"02br
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003) The teacher told Sue her comments were interesting but not___02br
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00a) stimulating02br
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00b) synthetic02br
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00c) relevant02br
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00d) peripheral02br
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00I think c and d both make sense, I chose d... But am I wrong?02br
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004) The boy didn't fall even though he was ___ on the edge of the cliff02br
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00a) peering02br
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00b) presiding02br
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00c) perceived02br
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00d) poised02br
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00--> I choose c, what about you?02br
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005) And two questions about this sentence:02br
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00" 01font00To reject folk tales as historical evidence02font00 because they cannot be dated and situated with precision like other historical documents is to 01b00turn one back's on one of the few points of entry into the previous century.02b02br
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00How can to infinitive stand at the beginning of a sentence? And I don't understand what they mean in bold, either. Please help me. Thanks in advance050030srchttp://www.usingenglish.com/forum/images/smilies/icon_smile.gif