Question 2: C. which -> that
Question 3: C. because of ->because
Question 4: D. do -> doing
Question 5: A. importance -> important
Question 6: A (đọc là /ae/)
Question 7: B (đọc là /id/)
Question 8: B (đọc là /s/)
Question 9: C
Question 10: A
Question 11: D
Question 12: C
Question 13: C
Question 14: A
Question 15: B
Question 16: C
Question 17: C
Chúc anh chị học tốt!