Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Thanks to advances (A) in medical science, life expectation (B) for both men and women has improved (C) greatly over the past (D) decades.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Their pioneering research (A) showed that the learning motivation of the two groups of learners was quite distinctive (B) from each other, and the comparative (C) group whose learning motivation was stronger performed better than the control (D) group.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

John's (A) classmates like (B) him since he is friendly, honest (C), and kindness (D).

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Richard enjoy (A) taking (B) part in social activities during (C) his summer holiday (D).

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Public speaking is quite a frightening (A) experience (B) for many people as it can produce a status (C) of mind similar to panic (D).

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The spokesman (A) had an uphill (B) struggle to find an explanation that was readily intelligent (C) to the layman (D).

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

All of the students should submit his (A) writing assignments by (B) Friday.