The great Gatsby? Help me please

What would be a good starter sentence for writing a review over hidden figures?

Mr and mrs van daan murmur their welcome what are the playwrights indicating by using the word murmur?

Which literary device has emily dickinson used in these lines? how dreary to be somebody! how public, like a frog to tell your name the livelong day to an admiring bog! metaphor alliteration simile allusion