Answer:
2) the drummer's sticks were thrown into the crowd after the concert
3) Ellen's eyes are red and itchy from allergies
4) the children's toys were spread all around
5)the teacher collected the student's portfolios so that she could grade them
6)the seamstress' sewing machine broke down
3) experts warned the virus will continue to spread in the coming days
A dependent Clause is a group of words, that have a subject and a verb, but cannot stand alone in a sentence. So, "<span>who had seen the tornado himself" seems most logical to me because they state subject and verb, and cannot stand alone.</span>