How do you find the root to a word

Dogs make wonderful pets because they keep us happy and healthy, the topic sentence is "dogs make wonderful pets". can someone me write a unrelated sentences to the topic and can be eliminated. need asap

Which choice is a major detail from paragraph two? a) the great wall is a large network of several walls and towers. b) the great wall looks like a long wall snaking its way across china. c) the great wall was constructed over hundreds of years beginning in 221 b. c. d) the great wall construction encouraged several independent kingdoms to unite.

Used for an event that has been completed before the present moment in time. simple past past perfect perfect progressive past perfect progressive