b, Because I don't know full answer so I cant do this questions.
(Không đủ dữ kiện để làm câu hỏi này. Xin lỗi bạn-Not enough data to make this question. I'm sorry)
c, TV brings us joys, sorrows, knowledge, information, events, things we don't know and want to know, an indispensable comfort in the family.
d, Yes, I do. Because I can study anything I dont know in it.