A metaphor compares things WITHOUT using like or as. similes use like or as.
the first one, with "stomach swims", seems like personification,giving an object human qualities.
I would go with the second one, some assume a simile to branch underneath metaphor, I'd assume.
the first one isn't comparing anything, so it's probably the second choice.
Answer:
40: where, weigh
41: wear
42: right, way, way, write
43: weak
44: grate
Jonathan Swift uses A. optimistic to F. to remind people of their childhood. The fact that he doesn't have any children made him eligible from his proposal.