Research suggests that the age at which toilet training takes place has risen over the years. in 1999, what percentage of children had been toilet trained by 18 months of age?

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )

the article must be ratified by three-fourths (38) of states within a proscribed deadline.

source:

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; the region experienced a surplus of food;