Which of the following is true about sulfur dioxide

Sulphur dioxide is a chemical compound and the formula is SO2. It is toxic gas with an irritating smell and pungent. Its produced by the product of burning of fossils fuels which are contaminated with sulfur compounds. It is found on earth in small concentration and also in atmosphere. It is found in the atmosphere of Venus and most atmospheric gas.

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.  

what words? are you talking about to complet what sentence