I'm not sure about all of them, but I think that most of them are right.
a) ewe/yew
b) beach/beech
c) led/lead
d) key/quay
e) plain/plane
f) pain/pane
I believe the answer is: c. question
The word 'ponder' mean thinking about a certain thing carefully, even if it took a lot of time to do it. This word is often used in a situation when someone trying to find an answer in an unfamiliar situation. Because of this, it think the word 'question' has a similar meaning with ponder.
Answer:
Using the 3 Rs
reuse, reduce and recycle (explain further)
stop littering, especially places like the ocean.
Answer:
(was the room haunted)
is the passive form of was it a haunted room.
Because he can, what DJs can't smile what up with that.