A. Never use words like I, I’ll, we or you in an essay unless you are asked to write in the first person.
B. The observers up front were asked to sit down so that the ones in the back could see. When you are talking about people, you use sit, not set.
1.have to
2.must
3.should
4.should
5.can
6.should
7.must
8.cant
9.shouldn’t
10.cant
11.can
12.have to
13.shouldn’t
14.must
15.should
Espero que te ayude !
'That' is A, a demonstrative pronoun. Because you are referring to that person, you are basically pointing at your cousin, therefore it must be a demonstrative pronoun.