Which of the following sentences has an error in agreement?

everyone should wear his or her seatbelt while flying.

flies is buzzing over the trash can.

two girls and a boy are here to deliver the papers.

did anne or her friend mary leave her wallet on the table?

dickinson punctuation and lines in her poems to establish a rhythm. each reader will naturally find themselves reading the poem in the same way. she uses the repeating question marks and exclamation points to convey the passion in her words. shelley uses punctuation to paint a picture in the reader's mind. for example, the ellipses after "stand in the dessert" evoke a silence, as it would feel in a deserted, old place.

i guess you are missing the idea that has to be supported, am i right?