Choose the underlined part that needs correcting in each sentences below. 31. Books can be used (A) as a tool opening (B)up (C) new worlds for (D) children. 32. Spend (A) time with family can always be (B) the most precious(C)experience (D) to anyone. 33. According to a research, sending(A) text messages or using (B) Facebook while doing (C) homework reduce (D) students’ overall GPA. 34. It is important for (A) parents to teach (B) their children how using (C) soci. Media wisely (D). 35. Each (A) person have (B) different ways (C)to relax (D) in their free time.