Answer:
1. seems likely (I guess)
2. perhaps
3. suggested
4. likely
5. maybe
6. apparently
7. according to
8. predominantly
9. conceivably (ig)
10. likelihood
11. perhaps
12. necessarily
That was Rainsford............
Norgay started the narration about
the climb from himself but then narration is shifted to Hillary’s climb and
focus is on the events of Hillary’s incomplete account. Later he resumed the
narration of the adventure providing pauses and bringing in Hillary time and
again. It seems like the point is being made that the climb would not have been
possible with anyone’s single efforts rather it was a joint effort regardless
of whose step was the first step.
It is "consistent support of the topic sentence". The sentences are all strung together because they all focus to support the same idea. :)