Which word is correctly used in the sentence?

what is the correct of the word?

use
used

Hhelp me

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

In a group discussion, which statement most clearly uses evidence to support a conclusion? a) the author makes some good points, but i feel that he’s ultimately biased. b) the author proves that he’s biased when he uses terms like “silly” and “stupid”. c) the author obviously hates the way fast food tastes, which is why he’s negative. d) the author first criticizes fast food, and then goes in to criticize junk food.