There are two basic reasons to add -ing to the end of a verb: to form one of the progressive tenses or to make a gerund. as for the to thing I'm not to sure what your asking
The Woodpecker once helped the lion by getting a bone out of his mouth. He put a stick, and took the bone out. The lion did not eat the woodpecker since he helped him. But when the Woodpecker asked him for help, he said that he already did not eat him, and he shouldn't expect more from the lion
At a ticket offer, a man inquires of the narrator if he has insurance. The man says he doesn't but would like to buy one for the next day when he will in fact be in bed and not travelling. The man goes into a detailed explanation that when doing extensive research on the subject matter, he discovered that the statistical likeliness of dying while on trains or boats or other modes of transportation is significantly less than the likelihood of dying in bed. To that end, he swears by only purchasing insurance when he knows he will be staying in his own bed as opposed to any other place that he encounters.
Reflection
This was definitely typical Twain, pointing out the obvious at the risk of sounding ridiculous and done with such style and matter-of-factness that you find yourself questioning why it is that you might subscribe to such an idea in the first place. Though it is clearly a fictional "I" relating the tale, one can't help be see Twain himself making the argument in some social setting and having people find it convincing.
Answer:
in general d sounds most convincing, even tough I often went with a. but the risk of failure is high and if the amount of material is just too much for one day it will just not work.
b and c just don't sound like good strategies at all, but the choice depends on the material and the time and resources you have.
