Answer:
Percy starts to suspect that Ares wasn't acting alone when Ares goes it to a trance and the starts talking to himself.... because Ares is going to say that to everyone because Ares is the God of War.
It should be D vex means to be made annoyed or angry.
1) One of the most formidable enemies of the tarantula (happens) to be the scorpion.
(happens-singular , describing the word 'One' )
2)The venom from tarantulas (is) as potent as a bee sting.
(is- singular, describing the word 'venom')
