Line 4: “Keel” has multiple meanings. The first is the part of the ship that goes along the underside that gives the ship stability in the water. This usage really doesn’t make much sense, though, because one can’t see a “steady keel” unless the boat has fallen over. The other use of keel here is as a synecdoche. The keel, a part of a boat, is used to represent the whole boat. More importantly, "the steady keel" lets us know that, despite its rough trip, the ship (like the nation) remains steadfast and true.
https://www.shmoop.com/o-captain-my-captain/ship-symbol.html
When a sentence uses the active voice, the subject of the
sentence performs the verb as in the following sentence:
The boy kicked the ball.
Here we see that the boy is performing the action of
kicking.
When the subject of the sentence has the action performed to
it, then, that is what is called the passive as in the following sentence:
The ball was kicked by the boy.
Here we see that the subject, the ball, was receiving the
action/verb of being kicked.
Answer:
1. This house was bought by Peter.
Explanation: