preposition.
1 Mount Everest is the tallest
mountain to/on/of Earth.
2 We still don't know
with/for/from certain who
reached the summit first.
3 Mallory and Irvine started
climbing by/on/in the hope of
reaching the summit.
4 At/Of/On the time of
Mallory's expedition, climbing
equipment was very basic.
5 They think the climber died
under/about/from a bad fall.
