"My own line of reasoning is to myself as straight and clear as a ray of light." Paine most likely uses this language to convince his audience that
he is completely confident in his reasoning.
his reasoning is supported by many others.
his reasoning is influenced by the laws of nature.
their reasoning is flawed if they disagree with him.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

bikhri bikri zulfain..ye behki behki chaal

where are the options? i can try to if you add them : )