The Grand Canal was a huge feat of engineering that linked the Three Kingdoms.
1.True
2. False

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."

it all depends on how long the hours are. i think they wouldn't approve of it. in my opinion.

answer; narrator;

answer; integrative;